I just brought a 1987 IROC it has a 350 5.7 and I won't to get a lot more power out of it I won't to know if I should keep the tune port or should change it to carburetor.

 

Im assuming won't means want

Anyways it all depends on what your goals are if you just want a low 13 sec high 12 sec car you can get away with porting the stock pleneum and getting new runners and a high flow intake manifold. I personally wouldnt get a carb, if you want to get something new get a Holley Stealth Ram intake.

 

TPI is basically the wiring and switching grounds for the injectors. With this setup, it is almost identical to bank fire which fire an entire bank at once. What I think you're referring to is the intake which in stock form, chokes up high. I would grab the stealthram and keep your ecm.