Only runs 40 Degrees advanced

Or, he can pull the valve cover and VERIFY that the cam is timed at least half assed close before he wastes any more time.

It's actually even more simple than finding TDC.

Unless one valve is open way further than the other, the timing chain is on half assed close.

Again, another thread about th TWO MOST IMPORTANT things when building an engine.

Verifying TDC and degreeing the cam. Neither one is hard, but I'm betting 95% of engines assembled neither one is done.

That's why a GOOD shop that does compete assembly charges 1000 and up for assembly. The engine goes together 3-4 or more times before final assembly.