Anyone running M&H Racemaster Drag Radials ?

That's similar to what a 225/65/15? I was looking at the same tires what rim width in the rear and what offset do you have?
4.25" rear spacing 15 x 7 wheels. '69 Dart with no body mods, just S/S springs. I have 225-60-15 tires now which fit nicely. The specs on the 26 x 8.5 M&H tires are very close. The M&Hs are about 3/8" larger in diameter.