I have a 1989 Firebird Formula 305 tbi I want to get a little help to make it better I know 350 swap I do plan on that just not yet 305 is still good I'm thinking shorty hooker headers a good 4 barrel carbed intake I have the adapter and a header back 3 inch exhaust. Any good info would help thanks

 

I would do what you can to achieve a better air intake and a better output with headers and better Y pipe like you mentioned into the 3in cat into a 3in cat back.
Then other then regular maintenance and changing bolt on items as you go using performance parts where you can then I would leave the 5.0 alone .


I would be looking at your rear differential.
If your stock and have a manual transmission you have the 3.08 ratio. If your auto trans. than its the 2.73 ratio and if you don't have the G92 option in you RPO codes its an open differential. = No Posi/L.S.D.
The only way to really know what's in there is to pull the cover and look.
It most likely needs the oil changed anyway.


There are a few different ways to change your ratio and install a L.S.D..


It depends on what your going to be doing with/ driving habits/ tires/etc. the car as to how strong you will need it.
Dropping a 400hp engine in with slicks will require a stronger rear then a ten bolt. But.....with my little 5.0 ,automatic transmission and street tires a built 10 Bolt has served me well.


Switching from a 2.73 open differential to a 3.42 ratio with posi unit was a
HUGE performance improvement . From the way it jumped off the line to the way it handled around town.
Hands down the best mod I could have done to the car.

 

I have a auto and I've been looking into that I have chosen Hooker Competition Headers 2460HKR
and just have my local exhaust shop make a y pipe I don't know if I want to get a intake yet I have heard you can drop 350 vortec heads on these 305s and they help plus have 350 parts to re use later i am looking for a cam i could reuse to plus give the 305 a boost

 

i think after i do the exhaust i might throw this in
Summit Racing Part Number:CCA-08-302-8

UPC:036584780564
Cam Style:Hydraulic roller tappet
Basic Operating RPM Range:1,200-5,200
Intake Duration at 050 inch Lift:210
Exhaust Duration at 050 inch Lift:220
Duration at 050 inch Lift:210 int./220 exh.
Advertised Intake Duration:264
Advertised Exhaust Duration:274
Advertised Duration:264 int./274 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.480 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.480 in.
Valve Lift with Factory Rocker Arm Ratio:0.480 int./0.480 exh.
Lobe Separation (degrees):112
Computer-Controlled Compatible:Yes
Grind Number:CS 264H-R12

can reuse with the 350 later any big changes have to be made to use this cam

 

Interesting. I don't know if I've seen that Comp Cam before.

 

I found it while searching the forms the guy that posted it said it work with all factory parts exept valve springs