You might want to look for a 1970s 25 inch Motobecane Grand Record. They came stock with 27 inch wheels, center pull brakes, and lots of clearance. They can take a really fat tire if running 700c.
Have you checked out this thread?
https://www.bikeforums.net/classic-v...ge-bike-2.html
Look at post 33.
inkandsilver mounted 42c tires on a very tall Moto GR.
Of the various vintage bikes that have passed through my shop, the 70s Moto GR I own impressed me both with how well it rides and with how much clearance it has.