If it's for a 305 it's a Chevy and will interchange with a 350. If it's an Olds, it won't.
yes yes
Not likely. They are two different bolt patterns.
The original trans will be fine. The parts you need off your old motor is the carburetor and the fly wheel. If the new(er) motor happens to have EFI, don't use it. Just to make things much simplified. yes the 350 will bolt right in but i don't know about the tranny that's already in it you might have to get the Chevy 350 trans for the tranny to match motor but motor will fit
It might. You'd need to check the diamter of the output shaft of the trans.
it depends on the engine you have. the most common combo is the 350 V8 5.7 L has a 350 turbo hydromatic tranny.
YES
Yes. It may be bigger but it will bolt on.
The 350 has NO electrical parts on it or in it what so ever ( NONE )
yes the 4.3L vortech has the same motor mounts as the 350
If the Buick 305 is really a Chevy 305, then the motor mounts will interchange with a Chevy 350.
yes.
No, they will not.