I own a 1958 Johnson electric start full gear shift motor. It cost me $200.00 because it was missing. New top crankshaft seal & clean up the mag & fix the points & it runs great. Oh, ended up resealing the gearcase with spaghetti & seals & no more water. The older OMC 18 to 20 hp motors run very well if not abused to the point of compression loss. I could pull a light skiier if I run my Evinrude 15 prop. In my thoughts nothing like a 50’s OMC for very well build non plastic reliable motor. Quite easy to perform service too. Mercury’s are fun too but are harder to work on. My last build, 1951 Merc 6 hp has been a challange for sure!!