I have dealt with the same issues while changing engines in my 3100. Like many other critical moments which I have done twice (the first effort and then the right way) I was privileged to need to install the front motor mount twice. The second time, with the motor in place, I loosened the rear bell-housing mounts and the tranny mount, then lifted the front of the engine using the engine hoist and a single lift point at the front of the motor.
I'll be doing the same yet again when I change the front mount bolts which I have since ordered. My new 235 still has vibration issues. It was not so hard or time consuming to remove the front mount.
Karl


It may not be the easy way, but it is the Cowboy Way - Ranger Doug
Beware of the stories you read or tell; subtly, at night, beneath the waters of consciousness, they are altering your world. - Ben Okri
1953 Chevy 3100
1960 Volvo PV 544
1941 Chevrolet Special Deluxe