I've run several Vanguards on a table with the engine plate clamped down with C clamps. Works well and no trouble.
If you're a jack of all trades and want something permenent and work on all of them when it comes to Cubs, I believe I'd start out with a Cyclops/82 engine plate so any Cub engine could be bolted to it using factory locating holes. I know the holes for all engines are not on all plates but they could be easily transferred to the plate.
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