Can anyone tell me if a supercharged engine & trans from a 99 Park Ave Ultra will be a good fit to put in a 01 Bonneville SSEi? Thanks.

I believe there will need to be some changes to both the engine and tranny mounts because the Park Avenue is a C-body, but I might be wrong about that.

My question now is why are you wanting to swap? They both have the same engine, did one or the other of yours die?

the engine and trans are physically the same, you will need to change a few engine and trans mounts from the current motor and trans

Is there a difference in accessory brackets also? I recall some problems Haro found when he put a GTP motor in his car.