I leave the original jack for the shows, but carry one of these in all my old Mopars. GM unit works like a floor jack, so bumpers don't get twisted and scratched. I removed the round "thingie" on the end, welded on a plate with "lips" to keep it from sliding off the car's frame. Good footprint, very stable, and, once upon a time, cheap as dirt at the junkyard.

floor jack gm 80s.jpg