I'm running 17x8 American Racing 200s classics(with gray centers) on my 69. I have 5 inch backspacing on all 4 wheels. For tires I have 235/45/17 for the front and 255/45/17 in the rear. Tires are BFG KDWs. The car has full Hotchkis suspension which lowers the front 2 inches and the rear 1 1/2. I'm also running DSE tubular upper a-arms and Baer 4-wheel disk brakes. I would think 255s in the front would be to big. 245/45/17 is about max for the front.
I think that's too much tire for the front (upper limit in width and too tall - 27"). You can get a 255/40-17 on a 8" wheel with 5.25 backspace on a very low car but the tire usually rubs on the inside against the frame - if you go with 5" of backspace it may rub the fender lip depending on how low the car is. These cars all seem to be a little different and when it gets to the max you need to check very carefully. I would stick to what was suggested above - 245/45-17. Good Luck.
I DID THE 255/45 ZR 17 FRONT, 285/40ZR 17 REAR
BOTH STANDARD BACKSPACING, NO RUBBING YET, BUT I DID USE THE QA 1 COILOVERS ON THE FRONT. YOU CAN SEE THE CAR AT MY SITE, CLICK ON THE BLUE 69. WWW.CAMAROMUSCLE.COM
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