[Blown353]

I've fit several wheels on 68-72 A-bodies for friends; assuming a stock width rear end, 6" or 6.25" backspace out back puts the wheel just about perfectly centered in the wheel well. 6" works well with factory drums, and 6.25" works well with discs out back because of the added thickness over the axle flange for the rotor hat. Anything smaller than 17" and you will run into interference issues with the lower shock mount.

9.5 wide with 5.5 backspace up front is just about right for stock spindles; if you are running B-body spindles you would probably be better off with 5.75" backspacing as the B-body spindles increase the track width by about 3/8" per side over the stock spindles.

I have fit 10" wide wheels on the front of a '70 using 5.625" backspace on stock spindles, but I had to replace the inner fender to fender bolts right at the wheelwell lip with button head allen bolts to keep the tires from rubbing when the suspension compressed. A very close fit.

Again, your mileage may vary and you really need to measure your car... factory tolerances weren't that great, plus there may be collision repairs and/or the body may be shifted on the frame a bit.

Troy