Greetings!
Got out today and played a bit. Timing at where the idle was although all over the place hoovered around 14degrees and seemingly into the curve already. Pulled dist cap and rotor and there were 2 light silver springs. I swapped one out to the heavy spring and that stabilized the initial timing. I couldn't do the test you mentioned in the prior post as I was alone, but I gave it some advance to 21 degrees initial and that helped tremendously with the idle and fan combo. As soon as I have an extra set of hands will continue with your method.
So... a new question would be now is there anyone that makes bushings for the MSD to accomodate smaller advance curves? MSD's smallest is 18 degrees in the kit. Motor was dyno'ed at 35 degrees so where ever I land with initial, I will have to adjust range to work.
Thank you!!