Swapping from 170 to 225

I have a 170 w/ automatic currently. It runs, but that's it. I ran across a 225 that was in much better shape, so I purchased it. The 225 was originally attached to a standard transmission. Now I am sitting here wondering if I am going to need another flywheel. I'd like to find out before I have the engine out. I'm aware that I need to change out the engine mounts. Both engines/transmissions are from 1966.

Does anyone have a clue? Different flywheel? Different bellhousing?