Wrong distributor for 69 318?

I've got it richened up quite a lot right now - 3 steps richer for cruise, and two stips richer on power (according to the edelbrock chart for me carb).
I also have an AFR gauge. AFR with the vacuum advance unplugged at cruise and idle is really rich - 11.5-12, down to 9-10 at WOT. With the advance plugged in, it
goes up to 14.2-14.8 at cruise. I'm assuming this is because it's pre-detonating from too much advance but I'm not sure.