Appropriate Wheel Offset for 18" Wheels?

Ran A disappointing 47.9. The Valiant with the A833 OD and a 3.08 rear is not the combo there, as first is still to short to use, but I'm also way down on RPMs in second. The 73-76 stock front Discs were also not ideal. On the upside, with the Hotchkis TVS and the 285 Hankooks all around the car handles fantastic, and changes direction much better than my 2013 Mustang GT (which ran a 45.9). I highly recommend getting out to Adams on Tuesday nights in whatever car you can, great track / track time for the $$

I've got work till 6pm on Tuesdays till December so it won't be for awhile. I know quite a few people from school who have raced there. Most of them drive an import of some kind.