Could you use an old style metal axle wheel to mount the tire on and then chuck it in a drill or Dremel tool and use a razor or PE saw to cut the grooves? You would have to make sure the tire turns really true so the grooves don't get too wide.
Check out post number 14 for some good shot of a frame that has been "z"ed in the rear.
http://www.modelcarsmag.com/forums/index.php?showtopic=59662&#entry714528
I might try to make my own, I have some ideas I want to try. I scored on a Bigfoot kit like this one with the early decals, I want to scan them in my computer and play with them in photoshop. I will let you know for sure once I try a few things.
The Eliminator package could be had with either the 302 or 428 engine and AMT made both versions and both are correct for a factory option. They put different wheels in each kit and when they used to put the description of what was in the box on the side of the box there wasn't any problem. It looks like somehow they test shot the 428 CJ kit but some time later decided to issue the 302 and just used the box art anyway.
Typical corporate geniousry. Their parent company was a food wholesaler and somehow didn't see the value in owning restaurants. They decided to concentrate on their core business and sell of the fast food division. Then they were bought by Phillip Morris and merged with Kraft.
Okay, I have the red 428 CJ kit and the blue Wal-Mart kit in my stash, the blue kit has the square slotted wheels from the yellow kit and the 302 engine with the incorrect 428 Eliminator stripes. The red 428 CJ kit has the Cragar SS style wheels.