i dont know much about engines

but can i use parts of 80's caprice engine on a 3d gen camaro?

because camaro parts are rare where i live unlike caprice's

 

which parts?

 

i mean any parts generally speaking

 

Generally speaking, some parts will fit and some won't.

To know whether or not Caprice engine parts will fit on a 3rd gen, you can't speak in generalities. You have to be specific.

 

heads? cam? intake? lifters? pushrods? valve covers? timing gears/chain? yes, as long as they're 87+ to 87+ or vise versa (I don't recommend re-using pre-87 cam/lifters)
rockers? carb? timing cover? sure they'll fit with almost any year.
water pump? alternator? possibly, but not sure.
exhaust manifolds / headers? probably not.


still more info is needed