hey guys i need some guidance here, a buddy directed me here because of some fast 305 owner's, my goal is to hit low 12's or 11's. im working with a 1990 rs convertible. so im going to give a run down on what i have,

 

i would just build a good bottom end. and then go with a xe268(or somthing close)
heads if you can get the trick flow ones if not just get a set of 113 and work them a bit.
as for the intake you can always try them both.
as for your 12 or 11 sec pass at the track a 100 shot on nitrous will help you get there.
but you will also need a good stall and gears along with a suspension setup.

 

I would run a good dual plane intake, i dont think the vic jr would run well on that motor. Cam id try next step down if you have decent compression. Its gonna want to turn 6500+ so that bottom end will be stressed abit. 4-4.5k stall likely will work. Its gonna abit sluggish below 4k rpm

 

ok guys thanks, yeah im going to get the trick flows because looking into the vortec's they need some work to get them to handle a descent cam, and i would be close in money by the time its all said and done, and the trickflows seem to have some room to work with and there aluminum so better for running boost later down the road if i choose to, now with a descent setup i would quess around 400 horse at the crank, and my buddy had a 1991 gt foxbody hatch, with the trickflow top end kit, 4.10's, drag radials, full weight gt, and himself being 250 lbs runs 12.0's to 12.1xx all day, i dont see why if i set my car up with a 4k and some 4.30's maybe and good suspension and tires i couldnt get the same result's if not better. who would you guys recomend for suspension and some sub frame's? thanks guys

 

Select the right cam to go with your 4000 stall speed, as well as properly matched gears and tire size. Invest in some steel main caps because your going to need to spin the 305 fairly high to get you to your goal, so don't rely on torque. Boost is a different story, as my 305 see's low elevens with 15-psi being babied out of the hole...

 

Unless I missed something, you're going to need a rollcage to run that fast at the track with a convertible.

 

yes im planning on a cage, im leaning towards the boosted route, im fairly certain if i do the home work, and take the time to test and tune a nice 305 on 8-10lbs of boost can net me high 11's, a couple people said i could also look into a custom built intercooler for the vortech would also help me out, anyone have info on a carb'd intercooled blower setup?

 

Boost would be easier to go fast with. Blower kits arent cheap tho unless you score them used. Home built turbo is easiest/cheapest to do IMO.

Only need about 350-360whp to reliably get into the 11's if everything else is setup around it and car is fairly light weight.