If you have the funds to do a lsx swap into the camaro, you should look into doing a 4.6/5.4 mod swap into the mustang. in your situation, I would do the fox body, I love those mustangs. Buddy of mine had a '85 gt, was quite the pocket rocket. OTOH, the camaro has that awesome cubby in the back that perfectly fits a pair of 12's, if that is one of your criteria.