Hi, this is my first post. Glad I finally found a tbi board!
I am looking at a 350 to put in my 90 formula with tbi. It is an early 4-bolt block (gm crate actually). I was wondering if the intake and other things would bolt up to it, the transmission also? I know i can get a 4-bbl intake and get the adaptor, if you coulc tell me what i need to do i would appreciate it. Thank you

 

You can bolt the heads and intake to an earlier motor. But the heads changed in '87. You cannot bolt a 87 intake to an 86 head but you can have 87+ heads and intake or 86- heads and intake

Another difference in 86- is that they are not roller motors like your 90 motor is.

Make sense?

 

the angle of the 4 center intake bolt holes are differen't you'd need to elonate those holes to fit both heads on the stock TBI intake. or you can use an old head style carb intake and slap a $12 TBI to carb intake adapter on there. You'll need a 350 knock sensor too and maybe 350 TBI injectors. The truck 350 TBI's aren't roller cam so that shouldn't be an issue as long as the knock sensor isn't too sensitive.

 

is there any difference in the bolts for the transmission, and could you point me in the direction of the $12 adaptors. Thank you.

 

I think the flywheel/flexplate is different, but the actual transmission bolts should be the same.

 

The flexplate/flywheels are different on the newer 1 piece rear main seal blocks. The 90 block is a 1 piece rear main seal but if it was a truck it could have gotten a flat tap cam, not all small blocks after 87 got a roller setup, they only were roller "ready."
There is no way to accidently bolt on the wrong flexplate, the newer ones have a smaller centerline for the bolts to the crank, the older style (2 piece rear main seal) has a wider pattern, same bolts, different location.
Get yourself a good performer or RPM performer carb intake for early small block heads (no special angles on center bolts). You can pick them up on e-bay for real cheap. Then order the adaptor plate. The plate you have to order depends on the actual intake manifold you get and what TBI you plan on using. Classic examples:
stock 1 11/16" TB unit on a performer/spread-bore manifold requires just a simple thin adaptor plate.
stock 1 11/16" TB unit on an RPM or other square bore manifold requires a similar simple adaptor plate that has the bolt holes for the square bore.
holley 2" and 454 units on a spreadbore require a 2" bore adaptor plate (duh) but again, this is a simple plate but make sure the adaptors bores for the TBI is towards the back of the intake manifold where the "spread-bore" is spread.
holley 2" and 454 units on a square bore require a special 2" bore adaptor plate with scalloped edges to narrow the passage into the small square bore, holley sells the adaptor plate and they have all the part numbers with pictures on their website. Call them if you need more information.
An alternative to getting the $45 adaptor plate for that last setup would be to use a standard 2" bore adaptor plate with the TB in the middle of the plate. If the adaptor is less than an 1" in thickness you'll need to grind a little bit of meterial off the sides of the manifold so the butterflys open and you don't have a nasty perpindicular edge! If you need more information, call up Holley, they almost always know what part number you need, just make sure YOU tell them what you need the part to do. Z28 boy has pictures of his intake manifold modification (grinding). I just used the holley adaptor plate because I didn't feel like grinding anything and I didn't figure I would have hood clearance problems...I did, I fixed it but that's a whole nother story.

 

I'm sure it is an early block '86 and back, so what would be the worst thing i would run into other that what Jprevost said?
I appreciate the input, thank you.

 

Okay.
I'm trying to remember what it was, it might be in one of my previous posts, but the heads have only one (instead of three) taps on the passenger side for accessories.
The accessires will bolt up, but you will find that you may have to figure out a way to fabricate or find a secondary bracket.
I can't remember what was done... I'd have to take a closer look at my motor....