Originally Posted by JT1973

That sounds like a great build plan. Clearly will be leaving it better than you found it. Excited to read the updates.

I've got a 1973 ToBritain that I will eventually convert to 650b with RAIDs. Right now it's pretty good with 700cx33-ish tires. Clearances on mine are tighter than what you describe, but mine was built with about 55mm of brake drop.

Thanks for the photos and good luck with frame mods.