scotch
+1y
It sounds like you are well versed at timing, but I'll ask just as a double check. Are you positive #1 was at TDC on compression stroke and not exhaust stroke?
When you align the timing marks on the distributor, and roughly center it within the adjustment range, the rotor should be a little past the #1 point on the cap, but then roll back towards the #1 point as the gears engage. #1 being at the 9:30-ish position when viewed from passenger fender.
When you were "off by 13 degrees", were you rotating the housing forward, so that the adjustment bolts were at the bottom of the adjustment slots? If so, sounds like you were 1 tooth off at that time. Most of the time I install the distributor, that's what I get on the first try.
When you align the marks on the distributor, hold roughly in the position as if you were going to install it, then put the rotor on such that it points towards the #1 position point on the cap.....9:00-10:00.