Centers Auto Drag info needed.

I have 15x8 1/2, 4 7/8 bs autodrags on my car, with 10.5x28 slicks. One side has a .300 spacer, the other .350. So basically, the 4.5 bs would be the winner. Too bad centerline didn't make em that way.....
I have billet wheel spacers that I made on an 11 sec car, a 9 sec car, and a formerly 8 sec car, tuned to run low tens. Good quality billet spacers don't bother me at all.