I have a 88GT with a Ford Motorsports E303 cam, Holley Adj Fuel Regulator, mild ported and milled heads, 3:73 gears, PRO 50 Shifter, Underdrive Pulleys, Shortie headers 2 1/2in H pipe minus cats with flowmasters, 90mm Mass Air, 2 electric fans,I still have the stock throttle body and fuel injectors I would like would I could do to get more and what are the effects of a bigger fuel injectors and a larger throttle body...recommendations welcome given what I already have..

 

Larger throttle body just allows more air to flow into your engine. Typically the gains are not very noticable until you have done modifications so you car requires more air. Sometimes bigger is not always better. As for the injectors they are calibrated to your MAF and the same applies, bigger is not always better. This is a sticky at the top of on of the 5.0 sections, Bolt on Myths destroyed. take a look and see what some of the gains were.

 

90mm mass air is awful big for your mods....but I'd get a decent set of heads and supercharge it