Stroker Motor wont Rev pass 5200Rpm

"Mystery Cam", "Custom Turbo Setup", undefined "Mildly Ported 360 Heads" with no flow#s. Honestly, that may be all She's got Cap'n. The turbo'd 340 We worked out in My Buddy's AAR never got much past 5,600-5,700rpm, with up to 21psi. The heads & the wastegate dump are gonna show You just how far they fall short right quick, and the cam could be all wrong, but ????????