I don't know for sure but I don't think the mount locations an FE would bolt right up. Can you post a picture of the crossmember setup you are talking about? One point of reference that I can offer is that I have used 429-460 angle iron engine cradles to mount FE engines. These are the stands that you can put the engine on and store it on the floor, not a regular engine stand. They mount to the engine with two of the motor mount bolts that are in the block, and two of the bellhousing bolts. To make the 429-460 stands work I've had to drill new holes for the bellhousing bolts into the stand, but the bolts that go into the engine block in the motor mount position lined up pretty well. So probably the engine mounts are close between the two engines...