The parts will interchange as long as you use the same heads. If you want, you can have steam holes ported for the new 350 for better compression. A good machine shop will be able to do that for around $80.00.
Most parts are interchangeable
Almost no parts are interchangeable.
The distributor and the oil filter.
1975-76
Yes! Nearly all chevy parts are interchangeable. And even pontiac parts with the same motor are interchangeable. But yes. The steering column is interchangeable
Yes
"SBC headers" typically refer to shorty headers for a Small Block Chevy engine. These headers are aftermarket performance parts that are designed to improve exhaust flow, increasing engine efficiency and power output. They are often used in high-performance applications or custom builds.
1995-1997
All body parts will, and most of the engine parts will too.
1988 to 1991 most parts are interchangeable - body styles an other things changed after 1991
Yes
It would depend on which parts. Give us more info.