Sounds like you are alright on the basic piston height. It would be a small miracle to have two distributers in proper mixture adjustment on a switch though. Get closed loop activity around zero milliamps EHA current and then see if it is similar at 200rpms constant speed. If more than 10% different you have a problem.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician