I wouldn't sweat the numbers too much, although the peak seems low at 5200. Any idea of the spring pressures used?
To give you an idea how different these dynos can be. The last 455 I put together for my father, bored to 463, had a 254/262 @ .050 hydraulic roller with .628 lift, 330 cfm Edelbrock round port heads ported by Kauffman, 10:1 compression, and 2" hooker super Comps. Dyno'd with a 950hp and tried 3 different intakes and spacers, including a Victor, RPM air gap, and one other I don't remember.
It made best power with the RPM air gap and 1" open spacer. It only peaked at 500 hp but made 604 ft lbs. Odd power spread but this was another conservative dyno.
Didn't matter much, because the car was running at the track right along with some other 600hp engines we were either involved with or had knowledge of, and even spanked a couple of them. So dyno numbers can be misleading sometimes.
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