1971 Trans am Questions.

[trans am kid 17]

I am 17 and building multiple future pro touring cars and have a few questions and need some advice. Im putting a oldsmobile 455 in my 1979 Trans am, and a Buick 455 in my 1971 Firebird Formula and wondering if there r any major modifications to install these engines. Im trying to get them done as soon as possible and am also looking for parts. Ill appreciate any help i can get. Thanks