and would i have to buy el camino parts for Chevy 1500 tranny or would i buy Chevy 1500 parts for the tranny?
yes
Yes it will, it is the same bolt pattern.
Dextron.
It depends on the transmission and any modifications to the engine.
You will need to remove the transmission.
A Nissan 300ZX? No
It would never hold together.....
If it's a 350 from a Chevy, yes.
usually around 1200-1300 rpm
Yes you can, but a 350 is a small block, not a big block.
There are adapters for everything.
As long as it has the Chevy bolt pattern, yes.