best thing to do is leave some stockers on there, and slam it, and measure what kinda clearance you got... i would assume you took out the inner fenderwells?
see how wide you can go in there... but ive seen 245s in the front slammed, you can fit alot in there.
i have 235/60/14 on the front of my truck dropped 3" with the inner frnders still in place and i still have like 1cm clearance between my tire and swaybar, i don't remember my offset right off but i think its just stock s10...