My 1:1 1962 Corvette has a similar issue in fitting the spare tire into the trunk well; The original-equipment bias-ply 15" tire fits just fine, and the factory plywood well cover sits flat over it allowing the rubber trunk mat to fit properly. However, I run the same size radials to improve the ride & handling of the car (and they do so very nicely), and they will not fit in the well at all. Oh, well - if I get a flat on the road, that's what the auto club, cell phones and credit cards are for.
I have enjoyed your build since the very first post, Roger. You are a true craftsman, and I enjoy the progress we see from week to week. Thanks for taking us along for the ride.
Dave Reeves
Syracuse, NY USA