I turned the EHA a 1/4 turn CW and it has appeared to help my warm start out. I may turn it 1/4 more and see what happens, certainly can't hurt. Cold start still exhibits longer cranking than I believe to be necessary, but could be perfectly normal for the M103 for all I know. My M117 fires right up with minimal cranking but also has half the miles. My 300SE fires up quicker and the mileage is around the same (maybe freeway miles vs city, being high RPM?)
Car runs fine after a cold start. No stalling, no surging, no anything really. Power is adequate for what the car is, moves along fine (it's no 400E, but gets the job done). I'm not wondering if my worn head is causing a drop in cold cranking compression to fire up.
Then once hot/warm the guides have expanded some against the valves
The fuel pump is very noisy and with the mileage/years I'm going to go ahead and replace it for piece of mind. Maybe if it's not putting out enough flow/pressure, pressure to the fuel distributor is off causing the differential pressures to be off.