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I would recheck the valve timing.
Hope it is not too late.
Have seen this many times where timing marks are misinterpreted.
What exactly are your compression readings?
Threre is no reset as such.
If you have compression, spark and fuel, then one of them is at the wrong time.
Can you check the firing order, since you have a one piece coil pack?
Can you check the injector harness is correct for that head, not on backwards?
Have you reverified the valve timing is correct?
Did each head go back on where it came from?
Is this a single or twin cam per head?
Does the exhaust smell of unburnt fuel?
My bet is some valves are not seating after the head work was done.
75 and 80 psi is certainly low.
Ask him to now perform a PROPER leak down test.
Each piston at TDC compression valves closed.
Saying the rings are gone, is the easy way out of the job.
He does not understand that if it ran fine before the headgaskets, then a leak down test will tell where the SUDDEN loss is.
Any good mechanic knows that.
If he says you only have 75 and 80 psi on those 2 cylinders, the valve timing must be wrong.
Let's see what he comes back with.
That's not a good sign if it is puffing air out the oil cap.
A little air could be normal.
Further investigation is necessary.
Leak down test and cam timing verification is the next step.
I hope you can sort this, and I hope my advice has been of assistance to you.
How did you go with your problem?
I hope my advice has been of assistance to you.