Many are not fond of MACS/Ecklers.
Berts is known for their parts, new and used, and stand behind what they sell. They refurbish/rebuild their own distributors. I had wireless nurex plates and had to replace the plates with original wired plates. The mechanical/electrical connection caused strange issues.
Here is their rebuilt original design, I believe you can ask them to install other designs. There is an additional $35 core charge, you return your old one. They will ship you the rebuilt one. They charge you the core charge, and you get a core charge refund when they receive the old one.
https://modelastore.com/electrical/d...roduct_id=4196
Modern uppers are OK, but if using modern points you may need to use Brattons point block to get the points arm contact and the point block contacts to align properly.
https://www.brattons.com/machined-di...int-block.html
Condenser, call the vendor, ask if it is a short proof A and L. There seems to be a high out of the box new failure rate on others. A and Ls are pretty good, but you can still get a new bad one.
A 6 volt coil has internal resistance of 1.5 ohms across the small wiring posts. It can be used on 12v if a 1.5 ohm series ballast resistor is added.
A 12v coil has an internal resistance across the wiring posts of 3 ohms.
Snyder's, Brattons, Mikes, Berts are all reputable vendors specializing pretty much on Model As. There are others. Sticking with these vendors get you the best service, stand behind their product, answer questions since they specialize.
Welcome to the Barn.