Hi folks. I have a '67 122S coupe with a B20B (out of a '71) and an automatic. So I'm likely going to purchase the bits for a manual conversion to get the terrible BW35 out of my car. I found a guy who can sell me: two M40s, driveshaft, shifter, pedals, clutch and pressure plate, bellhousing, clutch master and slave. I do have a couple questions:

1. I could take the clutch and pressure plate from the donor car - should I also take the flywheel? Or do I want to plan on getting my old flywheel machined and use a new clutch? Basically, what clutch/flywheel parts should I get from where?

2. When I have pull the BW35 off my car, is there anything I should do "while I'm in there?" Is this a good time to do the rear main seal? (I don't think mine leaks but I want to do as much preventative maintenance as possible while major parts are off the car.)

3. The donor car comes with two M40s. Is there a way to "bench test" the transmissions to see which one is a better candidate to install? I would prefer not to rebuild one if I don't have to. Can I pull off the cover and visually inspect the gears? What should I look for?

4. I'll be swapping driveshafts to the correct M40 one. What should I be looking at on the driveshaft? Are there seals or bushings that might need to be replaced? How do I check the condition of the U-joint?

5. This is coming off a 122 that was in a front end collision, so I think I have free reign to take any bits that could be useful for the swap. Is there anything I didn't list above that's a "must-have" to make the swap easier.

6. Should I be taking the M40's crossmember, or will my automatic one be adaptable if I move it forward?

That's all I can think of right now. If I have more questions I'll ask them. Thanks!