Misfire at cruise, popping/afterfire at 3000RPM

I dont trust the blue ECU boxes, they lose timing on the top end. You may want to consider an upgrade.
Please post close pic's of all 8 plugs make sure they are numbered by which cylinder they were in. The pic's need to show the ground strap so we can read the timing.
I have a suspension that they will be pig rich.
Have you run a compression test? If so, how much cylinder pressure did you record?
I apologize for not replying sooner, been busy with other things. The transmission is currently out and the engine tilted back, so I haven't been able to pull the plugs just yet, but I'll get after it when time permits and post pictures.

I haven't done a compression test since the heads came back, but previously I saw numbers between 150-165 psi. I'm not sure if the variances were due to my cheap Chinese compression gauge or user error, or just normal variances in the cylinders. I'll run another test when I pull the plugs.