Anyone know the right backspacing for a 15x10 weld prs star? for the rear? Andrew

I've got 15 by 8 welds on the back of my 91, I used a 5.5" backspacing and run BFG 295/50/15. I had to hammer on the inner fenderwell some to get the tire to fit, so I dont think you will be able to use more then 5.5".
15 by 8 wheels center the tires just right in the fenderwell - they dont stick out!

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91 B4C 305 TPI - SOON TO BE 383
TREMEC 5-SP, STOCK 1-BOLT REAREAND w/342 GEARS, K&N, AIRFOIL
EDELBROCK HEADERS, DUAL CAT TO HOMEMADE Y-PIPE & 3.5" SINGLE PIPE W/ FLOWMASTER, CRANK PULLEY, MSD, FUEL PRESS REG, COWL HOOD, WELD WHEELS
14.1@ 98MPH
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OTHER RIDE
67 CAMARO - STREET CAR, BIG BLOCK, PUMP GAS
350TH w/ATI 10", 12-BOLT w/373 GEARS
10.94@124.13 ON MOTOR - ET-STREETs w/MUFFLERS

I have a 88 camaro with 15x10 pro-stars. They have 5.5 inches of back spacing with 275/50-15 hoosiers. My wheel wells where already hammered slightly but now I have over an inch of clearence on the inside and they sit flush with the lips on the outside. I still spin in first gear even on the track.