slo5point0

I have the following mods: 90 GT 5 speed, plan to get 3.73's soon, i have gt40 heads that have been 5 angled, gt40 intake, powerdyne 9psi kit, small cam not much bigger than stock but want injectors to handle more cam as well for the future. i was looking at 30's which are rated for up to 480 hp. i know im not near that mark yet but these give me room to grow and the duty cycle wont be too high.

NotchAbove

I think your first step would be to estimate the horsepower. I would guess your going to be around 400, so the 30's would be ideal for now. You could go for the 42's but that is a huge jump from the 30's. I would go with the 30's personally.

24's are 26% larger than 19's.
30's are 25% larger then 24's.
42's are 40% larger than 30's.

slo5point0

well a happy medium could even be the 36's. just not sure what to get, and im pretty humble when it comes to estimating my hp, so its a tough call unless i got it on the dyno

PRO50SC

Put in some 42's, matching blow thru mass air and a tune and call it a day. Spend once!!