Despite being nearly the same size, they are 2 very different engines
The Oldsmobile block is a different Bell housing pattern than the Chev But Most 305 were the Chev engine regardless what GM product they popped up in
Oldsmobile used to make a 307 V8, but it has nothing in common with a Chevy V8.
yes, HEI distributor
yes
No
around 18 with 305 engine
looking down from (ONTOP) of the engine they are behind the water pump
yes it will
yes
yes the balance damper will be the same
TH350
8 deg. BTDC