motor mounts are easy, no need to loosen anything but the mounts, my only advice, loosen but don't remove all the nuts on all three mounts, then relpace one mount at a time, install but don't tighten nuts til all mounts are installed. This will give you lots of secure wiggle room for installing mounts and ease disassembly/re assembly. small bottle jack adjacent o the mount you are changing just enough to lift for clearance, with adequate load spreading (2x4). This way you are not lifting the engine just shifting it's wieight to the other mounts. BTW if it's not obvious, change the worst /failed mount first to ensure the motor is secure.....not too mush of a problem with the 120 as mount failure still maintains support.
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Patrick, '68 220 (used to drive 240s)