I would probably keep the F dash, only because the cars are becoming scarce and orginality blah blah, but the F Body cluster was pretty pathetic, right up there with the Chevette
As to the drip trim on the 4 doors, I'm pretty sure that the ones on most of the M's came down the sail panel at more of a squared off angle than the Volare. I think it's not as straight when it comes down at the back on the Volare 4 door. The doors are the same, the windshield is the same but the sail panel and back glass is a lot less curved