Wheel/Slick sizing

I am trying to determine the proper/correct wheel/slick sizing.
69 charger se. 502 ci, 650hp. strange s-60 with 4:10 gears.
Tremec 5 speed on the way
Current 15"wheels with 60r15 10 bfg t/a street
drum brakes
This vehicle has never run a 1/4 mile track... soon it will
(then it will cost me more money)
Assistance and recommendations are greatly appreciated.
Thanks, Bill
Author: Workswell