Balancer is an SFI Summit type. It doesn't appear that there was much if any denotation. The plugs look clean and I'm very familiar with what this engine sounds like with denotation (don't ask).

Plans so far:

Change N2O line.
Inspect N2O screen at the solenoid.
Inspect the N2O solenoid plunger.
Attempt to fab up a piston stop and verify the timing mark on the balancer and timing chain cover.
Set the timing back to 27.
Set the tune back to the 65n52F shot.
Go back to the track and give it hell!