[nkaminar]

The rubber pads in the float-a-motor mounts can get cocked if not sitting in the metal parts correctly. Take the bolts out and jack up the rear of the motor with a floor jack just enough to enable checking the mounts. You may have to put the jack at the transmission. Check to see if the pads are installed correctly. Move the front of the engine over with a 2 by 4 or other piece of wood and block it into position. carefully lower the back of the engine onto the pads, making sure everything is in alignment. Putting the bolts back without the nuts can help with the alignment. After the engine is back down tighten the bolts just enough to snug things up. The float-a-motor mounts work better is the pads are not compressed too much by the bolts. Take the blocks out at the front. You may have to loosen up the front motor mount a bit to get the front of the motor to move over. Do not jack up the rear of the motor to the point where the throttle linkage can get damaged. It is really close to the firewall.

This all assumes that the frame rails are straight. First check that by sighting down the rails or using a string.

One other point: The float-a-motor mounts are mounted to the frame rails with the original fasteners, rubber sheets, etc. Check to see if parts are missing there or if the rubber sheets have gotten damaged or are hard from age. You can buy new rubber sheets and hardware. The float-a-motor mounts came with instructions or you can find instructions online here: https://www.snydersantiqueauto.com/c...AM%20(NEW).pdf.