Only runs 40 Degrees advanced

The cam could be broken, but I think that it would be pretty obvious by now. The fact that the distributor is still turning would seem to rule it out, but stranger things have happened. I could envision it breaking yet still driving the distributor and oil pump somehow.
Yeah I thought about that also the distributor is still turning and compression test was pretty good so it doesn’t seem like if the cam was broke that the compression would still be good. It’s a stock rebuild 30 over I had the crank balanced probably 9 to 1 and it has 155 pounds on all the cylinders but one and it had 160 and that wasn’t your regular warm test