Tirerack.com lists a Firehawk and a BFG in 255/60-15. It's a 27" tire so make sure it will fit when you turn.

It's pretty close in size to the 245/45-18 I run on the hot rod. That is definately the largest tire that will fit under an early B.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon