Thanks to Streetking: 69 max rubber

[cphsonic]

Just to share the info: inspired by Streetkings immaculate black 69 Sportsroof (http://www.1969stang.com/mustang/forum/showthread.php?t=2301&highlight=streetking), I got his exact wheel setup and duplicated it (almost, I have a different front end). His setup is:
* Front is 245/40R18 on a 18x8.5" wheel with 5.375" backspacing
* Rear is 295/35R18 on a 18x10" wheel with 6.375" backspacing
Rolled fender lips and a bit massaging on rear inner fender well.

I got the set of FR500 wheels I have wanted since I first saw them, with almost the same setup:
* Front 18x9" with 5,85" backspace, cut, narrowed 1" and welded back together to make a 18x8". Rubber is 245/40R18.
* Rear is a 18x10" with 6.38" backspace and a 295/35R18 tyre.
No rolled lips but I did have to get the 2lb hammer out to massage a 4x2" area on the inner fender wells. Nothing drastic.

This is what it looks like (still need to go 1" lower in the rear):







Also posted this on Stangnet. Exact copy - no need to read both.