Roller cam, lifters, and rockers in a 1972 Pontiac grand prix 400.?

[Duane]

it would be wise to change all, and inspect the cam for wear

 

[Larry E]

You buy it in kit form where every thing is matched.

 

[Brian]

Im restoring a 72 GP with a 400ci, everything stock, and I was wondering if anyone could tell me if i need to do any modifications to install a roller cam, lifters, and rocker arms. it has 96CC chamber heads, 2.11/1.77 valves. also, is there a difference between a flat tappet and roller cam?