Low-Profile body mounts?

[Derek69SS]

Does anyone make body mounts in either delrin or poly that are shorter, to lower my '69 Chevelle's body over the frame about 1/2"? I don't want solid, and I want it firmer than rubber.

Will it work? or will there be clearance issues with the floors somewhere?

With my LT1, I'll have way more hood clearance than I need, and i'm not afraid to hammer on my trans-tunnel. Valve-cover to Power-booster clearance should be OK, and I think I can adjust the front bumper brackets enough to line it up good. Anything I'm not thinking of?