Tubbing
I tubbed my '67 Barracuda myself, and only had about 20 hours in the actual frame work, another 20 in the sheetmetal. I am sure it would go much quicker now. I had a 60 series 14" tire on Ralley wheels all around before, and went with 29X18.5 M/T Sportsman Pros on the back, and 165/R15's on the front. I didn't think the handling changed much at all. It was a non sway bar car to begin with, so it wasn't much of a handler to begin with... The big bias rears do like to follow cracks in the road. For normal driving, I think it's fine, but it certainly won't help it corner any better. Good luck.