If anyone else wants to know, the correct ESA module to use when you convert to electronic ignition for 1988 OMC Cobra 2.3L (and others)
CDI Electronics P/N 123-9898-P
or the newer and made for higher amp coils model
CDI Electronics P/N 123-9800
They both require Ballast Resisters but the stock wire resister was fine for mine with stock coil
These parts replace OEM P/N 982749, 982755, 982774, 984036, 984276, 987281, 981730, 981740, 985902, 986342, 986837, 987738, 987739, 987740