Biggest 1st Gen Tires?

What are the biggest rims/tires I can fit under my 1st gen, front and rear? Is it possible to stuff 275s on a 17" rim under the front? I know the rear is limited to about 275s without mods, anyone have bigger?

?????

http://pub186.ezboard.com/fprotouringgmachinesfrm9.showMessage?topicID=276.t opic

..just look around the board on there. Lots of great information

:)
-Bud