I am finally starting my performance work as soon as my headers get here and i set up my 2.5" dual exhaust. I plan on running afr 185's, a new cam, rpm air gap manifold, and probably some je pistons on my 1969 Mach 1 with 351 Windsor. I want to know should i get the cam first so i have something to play with till i can afford the heads(Since they are relatively cheap)? Will i notice more power or will it just shift my powerband. Do i need to have a professional install it and is it expensive? Could i do it myself, is it hard? Any tips on how to do it if so? Will my motor need to come out? Any good cam recommendations for my motor and setup? Thanks in advance.