1970 Pontiac Bonneville - Mounting question

I have a 1962 Pontiac Bonneville. The engine block cracked years ago from not having antifreeze in it. The car has been sitting since 1984. I bought a 1990 5.7L motor out of a G30 van. Does anyone know what motor mounts can be used. The issue is the frame mounts. Thank you

Well, I thought this would be easy, but no!
Summit Racing has adjustable mounts that might work, but I have no idea if they would.