I'll probably be pulling off some parts from our '76 D300 (has a 440). We had it for sale when it was parked and turned out like every other one of our projects
My original plan was to restore it and find a 6BT to drop in, but that idea went down the drain when I saw how much work it would take to fix all the rust.
I am probably going to get the mirrors, and possibly the doors if by some chance the body lines *might* match up. The reason I want the doors is for their simple design, I like it a lot better than a full plastic panel for some reason. The front bumper will also get put on my '91