Well, I found out my electronic prestolite distributor was only advancing 10-12 degrees, bringing in total advance at only 22 degrees! I’ve since ordered the other replacement module I can find made by Pertronix.
In the mean time, I advanced the base timing to 15 degrees, which gave me 27 degrees total timing. Sadly I saw no increase in top speed. I was hoping to see a good jump. I guess I will see when the actual part comes in.
Guestimating the throttle position, I can get about 32mph out of the boat before the secondaries open up. Does that seem about right? Or am I dragging a big anchor?