They are schumaker rubber isolators. I've got slant six-340 conversion mounts. They use a stock size 2266 V8 mount for the driver's side, and a stock size 2265 slant 6 mount for the passenger side. I'm going to measure them tonight to make sure they haven't squished any.
If new mounts or shimming won't get it done, I'll just lose the mounts and move the motor around until everything fits and make up some solid mounts to hold it in that spot.
