That's exactly the idea, Ron! Outwardly, it will look identical to what you see here. I'm planning on still running the 383 decal on the air cleaner, and stock valve covers will stay.
Right now its a 2-bbl spec 383 with the stock small valve 516 heads. I've added a 750 Holley on an RPM manifold, a set of 1-3/4" headers, and a Delta cams hydraulic grind (238/.480 & 242/.496) with Rhodes lifters, a 2800 RPM converter and 3.91's.
Ive learned my lesson with this motor. It's way overcammed for the compression (advertised 9.2:1) and really is a bear at an idle.
I'm ordering rods for the new motor today.... One more piece to the puzzle!
If Ron likes the combo, I'm happy. I love your 63, Ron. And my best buddy has a black 70 340 Swinger just like your sons, only with a 408 Small Block.