Factory 383 with ps

I have a 68 gts h code 383 automatic car. Got the car missing a bunch of parts mainly the drivetrain. The car came with the big block k frame, big sway bar, correct torsion pars and it was orig power steering. I’m having a 383 built but it was a b body block. I have the correct engine mounts. I’ve seen some pics where the engine mount bracket boss on the drivers side rear is ground off. Is that necessary or is that for 440 cars? If it does get removed where does the dipstick tube mount? I’m sure there’s guys more knowledgeable than me on the big block a bodies...thanks