I’m looking to install the Bp 306 efi with auto package. It would be interested how yours worked out and how happy are you? How does it drive in hwy? Did you have to do any lift to fit the engine?
Can't answer for those that have done it, but just as a general statement, a body lift helps with later model automatic transmission installs for sure. For the engine, it depends entirely on what induction system is used.
Stock body height fits normal V8 stuff and normal C4 stuff just fine. If you go with an overdrive transmission, or a taller intake system (whether carb or EFI) then at least a 1" body lift makes like much easier. The more lift, the easier some stuff fits. But most of us prefer the lower 1" lift.
If you go with a really big trans, or a really tall intake, but don't want a body lift or want to keep it to a minimum, then some trimming/modifying/tweaking of sheet metal is required.