I agree with everyone else that the drivers side mount is a disaster; it needs replaced. However, some /6 to v8 mounts do use a bigger passenger side mount like these:
1971 PLYMOUTH DUSTER Trans-Dapt Performance Products 4695 Trans-Dapt Performance Engine Swap Motor Mounts | Summit Racing
They can be replaced fairly easily without pulling the engine so you’re not in horrible shape. I am curious as to which direction your tail shaft is pointing though!