I've got two modified '57-'59 distributors (to fit my 256" Merc). Both have only around 15 crankshaft degrees max. I thought they should have 12-14 dist. degrees advance which translates to 25-28 crankshaft degrees at around 2200 RPM. Both have three degrees advance at idle (500 RPM). If I set the static timing to 10 deg., when I start it it goes to 13 deg. I tried adding tension to the low speed (light) spring, but it did not change much , maybe one degree. The car runs strong with 14 degrees initial, but I'm concerned with doing damage. What gives?? Any advice will be appreciated. Thanks : Bruce