YES.
YES. The 74 and 86 engine blocks are the same as far as DESIGN.
You have to use the flywheel for the 1974 engine and the clutch plate for the Trans Am.
Nope.....Chevy will only bolt to Chevy. The other brands....Buick, Olds, Pontiac and Caddy share the same bolt patter.
Yes. You'd need to find a v8 donor car to transfer the emissions equipment, etc.
yes
yes
you first have to drop the transmition. there is one bolt on the transmission support and 4 on the engine . after that you will have to separate the pressure plate from the flywheel and then change the clutch
no
yes
The spark plug gap for a 1986 Chevy Celebrity with the 2.5L 4 cyl engine is .060".
Need to know what engine it has.
probably a 350 small block