Do they make a fuel tank without the spare tire cut out?
I shortened a 68-70 Charger tank on my 67 barracuda and used stock filler location. Just start perusing different tanks. Find out what measurements you wish to fall between and filler location.
Ill try to find my pictures of splicing and dicing I did on the charger tank. I bought it new and cut n welded. Then off to the radiator shop for final inspection.