i have a 96 trans am with a comp cam 503 in it and long tube headers and flow master exhaust. i am getting the heads and intake ported and polish and a 52 mm throttle body put on. my question is what size injector should i run with my set up?

 

30# injectors will be fine.

Truthfully though if you're only using a 503 the stock 24# will suffice too.

 

He could probably pic up some stock LS injectors (28 lbs vs. LT's 24lbs) for a very reasonable price from someone going FI too...

 

Sure he could, but there would be absolutely no benefit and a simple wasted expense.