I would suggest something like this, in Reynolds 531. Spend the rest on wheels, tires, and modern components.
https://www.bikeforums.net/classic-v...rse-socal.html
Look at all that clearance!
I have about a dozen frames and complete bikes, and my '76 Raleigh Competition is my fave. Very versatile. Easily clears 35's. You simply can't improve on a classic frame, IMO. The Brits had all this stuff figured out decades ago.