Both AMT kits originally had the torsion bar suspension but were switched to the extended leaf hendrickson early on. AMT didn't change the numbers to match.
The Revell snap kit is a perfect start with the exeption of the 8 bag air ride as it wasn't available yet in 1976. Most vit200s I saw had either the KW torsion bar or 4 spring suspension.
Many a b61 used the camel back suspension although very few used the heavy 55000 pound one found in the dm 600 kit. The lighter highway version found in AMTs cruiseliner and r600 would be more common. Same for the front axle.
Kinda of ironic I just read an article on Hall Scott and they discussed that KW. It apparently displaced 2239 cid no wonder it got 1.5 miles to the gallon.