just rebuilt runs bad

So, you are saying that it ran at 38 AS MEASURED AT IDLE????

This is really sounding more and more like either the timing marks are not right, or the cam is out with the crank.

With the timing advanced to run "good" as per your last test, what is the timing at high RPM?


And I have to say, at this point, a second pair of eyes sounds like a great thing to have.