TC@HP2
"IMO, Rapom, go to the American Racer website. Find the regional distributor for the IMCA G60 tires, pick up a couple for $110 each, slap em on, and tear up the asphalt. Or you swap them out for an entire new set of SRs at $250 each." Exactly my conclusion, but, there may be another option (for me), see below....

Pale Roader ~ I would be happy to run Mustang wheels and they would work fine in front but not in the rear. There are no Mustang wheels with a negative offset even close to what I need (narrowed A body 8 3/4, mini tub, custom 4 link) including the use of spacers. Can you imagine how bad I would get flamed here if I even suggested utilizing studs/spacers that big?

However... your comment got me thinking in a different direction. I'm going to do some research and will be back with my findings.