Vibration at quarter throttle

Primer66

Member
Aug 22, 2021
9
3
13
USA
Hey everyone,
My '66 with a 289 and a C4 seems to vibrate when I'm at about quarter throttle, enough to rattle the loose fixings. This only happens when I'm either decelerating or coasting. I currently have a bad engine mount but this has happened since before it broke. Has anyone experienced this/know a fix?
 
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