Whats the deal with ignition modules

I see 4 pin and 5 pin. I see an orange box that clearly is a Mopar part ( and is supposedly meant for high performance/high RPMS ) and then I see alot of other modules listed on E-bay that are various colors that have no Mopar stamp on them yet the seller says NOS.

I see ALOT of different part numbers which I do not understand, different part number means there was a change but I thought that the slant and V-8 modules were the same so why all the numbers and changes?


I am using a harness from a mid 70s Dart on my slant six, not sure what I should be looking for?

Thanks