An embarrasing side quest.

[Bob Bidonde]

You should not need to spread (bend) the frame to get the engine between the rear mounts. Sand the inboard rubber pads thinner. Also chamfer the vertical edges of the engine mount surfaces of the flywheel housing. Grease the inboard faying surfaces of the engine mounts. Check to see if there is any damage to the back of the rear main bearing from the bolts protruding through the flywheel too much.