FYI just cause AFR is 12.8 doesnt mean that is best AFR for the combo. various combos like various AFRs. was the AFR measured on dyno to see for best AFR? also you said conservative timing. Generally when you add a cam you need to be aggressive with the timing. Timing wakes up a vehicle. You can see huge gains just by increasing timing. i seen a gain of 66rwhp hp from 2* of timing on my setup.
also what is the AFR around 3600 to 4800 rpms? Generally you should be somewhat fat in this area with a little less timing.
also where the converter flashes at bump timing up good bit so it comes in harder.
his best time at PRP was beat and he ran his previous best at memphis with skinnys and etc