Ron,
I heard that they hunt and I can verify that. But can't that some of that be elimanted with alignment? Those tires are so rounded and not flat like modern tires.
I would never mess with regular street tires on my Kirkham. I had an SPF with a Roush 402R and BF TA's. That was scary enough. I had to be pretty gentle on the gas. With the Kirkham I dropped 500 LBS and added over 60 ft Lbs tq. That would be downright dangerous on those old 70's custom van tires.
rodneym