R/C107 SL/SLC Class
Recently needed to set ignition timing on my 73 450SL, USA model.
Tag indicates 5 Deg. ATDC at idle . Additionally, literature indicates 10-14 deg. at 1500 RPM and 18-22 deg. at 3000 RPM all with with vacuum.
Assuming the vacuum and distributor functioning correctly, which one of the above three...