I was interested in adding an EI to my 62 sedan. Looked it up in the Clarks catalog and it tells me EI is only for late models (164 CI). I was wondering why this would be ? Is it a difference in the distributor, if so can I swap a LM distributor into an EM and use it ? Or is there some other reason that eludes me. TIA Rex 61 Rampie 62 Sedan 65 Vert