Got a chance to run my distributor on a Sun test machine and plotted the following results below. The motor is ’68 2.0 130 HP, not a T or S. The distributor is AL body Bosh #231 159 001. The points seem to fall in spec with a curve I have for the dist #.

2K RPM – 10 deg.
3K RPM – 16 deg.
4K RPM – 18 deg.
5K RPM – 20 deg.
6K RPM – 24 deg.