Okay, thanks for the reply.
yeah, i've got one of the old Marlin adapter bell-housings they used to make before it was discovered that a W59 bell-housing (i believe) could simply be used instead so they stopped making them.
Guess I'll just have to wait and see once it's all apart on how the lengths of the trans and the input shaft and the bell-housing all compare to whats in there right now and see if any mounts need to be moved.