I've been working as a body shop painter for what seems like forever. Decades....jeez.
Anywho, what I'm trying to say, I can probably help talk you through anything on the quarter/rocker repair. Go slow and be meticulous, you can do it. Plus there is great satisfaction in doing the repair yourself. I assume you have all the tools you'll need.
Honestly, as opposed to my previous smartas s response. Go with the 351, bunches of potential there.
I have a similar situation with my pipsqueak V6 that I have in my blue car. It'll stay there until I have my whole new drivetrain bought and ready to be installed. Then I think I'll do something absolutely stupid with it that I can post on YouTube.