67GTO,
We modified a stock mount to provide a positive stop while retaining rubber cushioning for normal driving. It has worked perfectly for over 10 years on my wagon. It takes a bit of work and welding but that is what hot rodding is about.
This information is courtesy High Performance Pontiac, August, 1993, and my son Joe Hand. The hardened rod (referenced in the article) we used was a section of an engine mounting bolt.
Jim Hand
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