no on a 350 it is on the driver side and on a 305 it is on the passenger side
If the Buick 305 is really a Chevy 305, then the motor mounts will interchange with a Chevy 350.
YES they are the same.
The headers for a 350 and 305 are the same.
No they are not.
driver side front
Oldsmobile used to make a 307 V8, but it has nothing in common with a Chevy V8.
NO they are not the same.
passenger side gm made the switch so they can adapt a 305 engine into same car originally equipped with a 350
the block & heads are the same you just have to pull the 305 out & put the 350 back in
yes
yes
yes