Searching for a phenolic carb spacer

[29 Tudor]

With the percolation problems I (and others) seem to have with the gasohol we have now, I have been searching for a phenolic spacer to see if that will help by isolating the carb from the intake manifold. So far, no luck finding one. Has anyone got an idea where to find such an item?

If no one has a source, I might try to talk a machinist friend into tooling up and make me one (or more?)

Any thoughts?

Thanks,

Steve