My wifes first car was a Rivi like yours. She was 16 and I was 15 when her dad got it for her. We didn't really appreciate it like we should have. But now....... she would love to have it back. Hers had a LARGE factory chrome breather but I can't remember the cubes, maybe 435?. Love your car by the way and thanks for posting.
Gotta be careful with a 63-65 Rivvy. They are SO DAMNED BEAUTIFUL in stock form, you can't do too much to them or you'll be going the wrong way. I like what you're doing so far. Just save the Sawzall for the next project.