Visited the shop of another Mopar guy here in town a few years ago and he had the stripped down shell of the front half of a Valiant (?) set up on a heavy duty metal shop table used for a run stand. It was just the firewall forward with the two frame rails, the k-frame, and the rad support. Wiring and dash was still there and you would set the engine on the k-frame and hook the hoses up to the radiator and wire it to make it run. I can't remember what it had for a fuel supply, but most likely a gas jug on the floor with a rubber hose plumbed from it to the fuel pump. It was pretty creative and likely did not cost as much as a real run-in test stand.