Tire Size Opinion

[Corts60]

Hey folks,

There's a million threads on here about tire sizes, but I wanted your opinion on what would look best on my rig:

I am going to replace the tires soon and I'm having a hard time deciding on size. The tires on it now are A/T's and 235/75/15 on 8" rallys. They have a lot of tread left, but are almost 20 years old. They have to go.

I used to run 275/60/15's on my '78, but it was lowered and I have no plans of lowering the burb. So I'm thinking of running 255/70/15 or maybe just sticking with 235/75/15...what do you all think? Would 31" tires be ridiculous on a 2wd?

I want the wheel wells filled out a little better.

Your opinions are appreciated.