okay, youre on the right track. reasons to use a GT to start: higher compression, 3.29 gearing, cheap car. the only problem is that the car needs boost to go anywhere so youre gonna have to top swap it. in order to get any reasonable amount of power out of a top swap setup im gonna say that youre gonna want to run a cam again. because its a low end grunt race youre gonna want a cam that has a lot of mid range (VS or S1x).
at that point the only thing holding you back from demolishing a lot of other cars is you getting it to hook at the line.