When I had my 84 TBird I was running a pair of 12.5 M/T ET's on the back for a while for track use. On the street I had a set of 17" wheels I "borrowed" from a friends mustang that he totaled, (fox platform was great) and was running 305's on the back (can you even get those anymore?) and 255's on the front. (my inner fenders were rolled but that's not very hard to do).
1990 35th Anny. Supercoupe (under construction). 1991 Supercoupe (tastefully modded). 1989 5-speed Supercoupe (modded). 2003 Yamaha YZF600R (rocket)
1989 Taurus SHO (very lightly modded, but broken again)
1967 Ford F100 2WD (460 bored .060 over, too much cam and gearing for the street).