yes you can swap the 454 for the 350 its compatible usually any Chevy engine will match in the same vehicle might have to do sum fabrication but in ur situation you should be fine
If the cubic inch is the same the motors should swap out ok. You will have to change some parts but most Chevy motors will swap.
You can if the year of the 454 is between the years of 1988 to 1995
Yes.
YES, That would be a direct bolt in with NO problems. EVEN SWAP
Yes it is and its the easyest to do.
Swap the relay with another like relay.
As long as the 350 is a fuel injected engine / TBI / Throttle Body Injection engine there is NO difference.
You can swap the engine from your 1997 Cavalier 2.2 liter engine to your 2000 Chevy Cavalier. The wiring harness and motor mounts should be in exactly the same.
YesYes
This is an engine swap and will require engineering mounts, drive shafts, computers and wiring.
I think a Chevy V8 will swap, but with HEAVY modification. The main problem will be the oil pan clearance from the frame.
It would help to know what engine you're trying to swap in. Quite a difference between trying to swap in a newer engine of the same model and trying to swap in, say, a Chevy small block.