a friend of mine has started a project on his mustang. i'm not real sure on the year of the motor (302), but it is EFI. his question is, is it worth it to buy trick flow, AFR, etc. or would some GT-40 heads be just as good. he is on tight budget and was looking to make some good power with a heads, intake, and cam combo, along with maybe just minor UPR upgrades to the suspension. he plans to put some nitrous on later and possibly stroke it to a 347 or 331, but for now this is all he can afford. any help would be great. thanks.