I'm running a 275 on a 9.5" wheel on the front of my 69. In order to do so, you will give up quite a lot of turning radius, there are various rub points from inconvenient all the way up to dangerous if not dealt with appropriately. The best way to prevent over-steering issues is to alter the steering stops on the stock control arms, ala Speedtech's idea. I don't know what the rub points are with a stock upper control arm, I am currently running GW's (but only until our new arms are done later this year...). It's not pretty in many cases, inner fenderwells, had to remove a couple of bolts for the wheelwell chrome trim pieces, etc. Worth it? In my eyes, completely. The added grip is significant, and the look is mean. I don't know what the backspacing is on my car, but it's irrelevant for most folks as I have some one-off custom stuff on the front (brakes, wheelspacer, etc).
Carl Casanova has a write-up on this in his website with a lot of detail, including backspacing etc.
Funny, one of my customer is in the process of buying wheels for his car, and one wheel source told him the very biggest he could run on the front of a 69 is a 7" wheel with a 225 tire. Swore up and down. Crazy.
Mark
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