I have a 1986 OMC Cobra. The engine has been replaced with a 2000 4.3l Chevy engine. This engine has a conventional points. The ESA unit on the boat is a model#987567. From what I have found out, I believe this is the wrong ESA unit for this boat. 987567 is an ESA for electronic ignition. Does anybody know which ESA unit would be the correct unit for this type of engine????