I recently purchased Weld Rodlite wheels for my 1968 Barracuda. The Weld Rodlite wheels are 15x7 with 4.5 backspace for the front and 15X8 with 4.5 backspace for the rear.
Just this past week I've been seriously looking at new wheels for my 68 FB.
Ironically, I'm considering Rodlites in the same size and BS you have. (Another is Billet Specialties Street Lite) But the tires would be more all around street cruiser size and not drag oriented. I'm currently running 215/60 X 15 and 7" steelies on all 4 corners. I happen to think 255/60 X 15 look really good on the back of these cars.
Do you have any pictures of your car with the Rodlites?