I trust you do know Don T? I quote "(1/2) Tell Bill yes the heads got a basic 3 angle valve job by a machinist the builds everything from Bentley motors to circle track motors.". He also said its possible about the o2 wiring harness, maybe giving incorrect readings to ecm even though Im not getting o2 codes. But right now just speculation.

PS: Don is the only other person I trust working on my rig and is the one who did the engine swap.

 

Yeah I know Don, but your machined response was vague, that could just mean decked leaving the valves untouched. In trouble shooting it helps to have all the info.