the 3300 engine is a derivitive of the Buick 3.8 v6. The adapter for the 60 degree will not work. You might be able to use a TH350 with the BOP bolt pattern. Now, something else to keep in mind-this engine was intended for front drive. This means that many of the components have been made for this application only. You know about the mounts already. There's also issues with the intake manifold and cooling system. The upper hose/thermostat housing is on the back of the engine, as is the throttle body housing.
I'm not saying it can't be done, but it will take alot of engineering/planning to make it work.
