Power started to drop off at 5,300rpm and the engine refuses to go above 5,800rpm.

I want the MegaSquirt to control where it's limited (within reason). Though most agree, historically, the ports and such 5,300 is about where it starts choking off. Pontiac humorously put the redline at 6,500rpm for these engines. I'm probably going to port the head when I have it apart to try and gain some more airflow/rpm. I'm putting the top end back together tomorrow morning with the E-cam, that has more lift and duration.