fireing order? 225 slant 6

Your distributor cap & wire orientation looks pretty much like mine. It can really be any where as long as the relationship of the wires and towers to the rotor button are correct, and the wires are in the right order, and timing adjusts right. The position of the vacuum advance pot really determines the range of rotational angles where the distributor body sets.

So did you use a timing light to check base ignition timing when you were done? (I ask since this is your first distributor car.)

BTW, I went through Great Lakes 42 years ago! ET A1-A4 schools....but I got to be there in spring and summer.