Wow. Thanks everyone, some really good information here, thanks for taking the time to help. This forum is such a great venue for good people to help others.
Yes, I have the Euro distributor with the magnetic pick up instead of points, so 6 pin it is. Also good to know about the tach adaptor can! I’m unsure if I have it, but there was a silver can on one of the 70-71 fuse panels that I have. I’ll get a pic of the unit, hopefully with a part number on it, and post it here, fingers crossed I guess.
Given that I have all the components I’ll stick with the CDI for now, but I will consider the 123 ignition as well, particularly if the CDI unit doesn’t work – I bought it used a few years back and have no way of testing it... To that end, and to the point above, I think I will do a separate harness for the CDI. I have seen this somewhere along the way and may try to purchase or assemble something similar.
I don’t have the plug for the unit, but if all else fails I could just plug them in individually. I’ll also have to figure out how to split the green coaxial cable as well.
I do have the original Marchal Alternator with separate VR. I initially bought a Bosch VR, but have since located a Marchal VR, as I understand they have to match. As for the alternator portion of the harness, that all lines up so I don’t anticipate a problem there.
Thanks again, I'll be posting more I'm sure.