When we ran a full service chassis fab/turn-key hot rod shop a number of years ago, it was always useful to have threaded things around to weld into the frame for some kind of mount, etc.
Here’s a list of all our threaded things for your reference:
Engine Mounts
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Rubber Insulator; Small Block Chev, PR
C$33.00
Rubber Insulator; Small Block Chev, PR
Great for a budget build but will shake more than urethane insulators.