Pony war in my garage

Ive got a question for the public...i have a 1988 camaro with a 305 that is being pulled now i have a 355 in the garage for it and a super victor and a holley 750 cfm carb i recently baught a 2003 mustang gt and im inpressed which car should i mod and which do you think will be most helpful in the end a car(mustang) that runs and already has lowering springs new injectors roush intake k&n filter cobra breaks and dual exhaust(lacking headers and Under drive pulleys and cam swap) or the camaro that has alot of motor parts but alot of work still needs to be done.

any input will be nice...im not judgmental i am a fan of big motors with big horsepower...chevy vs ford is of no concern to me...