Yes you can order 1 from Dakota digital for about 650
Yes you can.
The 305 was standard in an 89 Caprice Classic, so the answer is obviously yes.
yes
no you dummy
yes u can
No
Remove oil-filler cap and add oil...
The exact same one that is in it now.
About any GM will go However if it has computer the engine must match.
Put a 4bbl carb and intake on it. If I remember they came with 2bbl
It is very possible i have seen it done dozens of times.