I had some 225 X 15 radials on the car and it looked like a street rod, tires were just too fat. Steering was heavy too.
I ended up replacing them with an excellent Yokohama blackwall 7.00 X 15 radial tire I found. This is the same tire that Diamondback uses to convert to wide whites. You can get these blackwall Yokohamas for about $100 each.
This is an 85 series tire, so they are tall and skinny like the original tires. Steering is very precise and light and the tires look correct on the car. But they do have large, raised black lettering that hardly looks period. But it is hard to see that lettering from 10 ft or more away.
Most dealers dont have these tires in stock, they are built for the RV trailer market. But my local dealer ordered them and they were here in just a few days. If you can live with blackwalls, they are a much lower cost alternative that the various wide whitewall radials on the market.