FYI- The Hurst mounts require truck oil pan and pickup, frt cover and some other stuff.I put a Y in a 51 vic back in the 60's w/Hurst set up and the crossmember is a problem w/them also. If I were doing this swap I think I would rather get the FE to Truck aftermarket crossmember. The FE motor mount pads are the same as Y's.
Goodluck,
Ron.