For my mud dragger, I went with polyurethane mounts from Energy Suspension. They install into the stock Chevy clamshell mount. There is no slop and they're holding up fine to racing. Mine came from the local speed shop, but you could get 'em from Jegs or Summit.
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'84 K20 driver
'79 K10 mud racer
'48 CJ-2A trail Jeep