No real problems it is a solid engine.
Who said it won't ? It will fit right in there with NO problems
10w30 weight oil.
Yes it will with no problems.
YES, It will bolt right up with no problems.
If the Buick 305 is really a Chevy 305, then the motor mounts will interchange with a Chevy 350.
It will be a 305 or a 350 fuel enjection engine ( TBI )
Most common a 305 or 350 v8
Oldsmobile used Chevy 305's. 76 350 rocket 77 305 Chevy
There is no information on the internet about what the special feature of the Chevy 305 engine is, in fact, the Chevy 305 and 350 are interchangeable, one is just an older model.
305 horsepower
You can run 5wt-40 or better 10wt-30.
As long as the 350 is older then a 1987, you will have no problems. They will bolt right on with no modifying.