I am still waiting on a real dyno sheet to see if you had other issues ....
Cam in that engine .. is good to go and proven many times over, its actually a very commonly used cam for 582+ CI .. (not that you know anything about cams)
Heads on the engine ... Surely not the issue why its laying over at 6200 rpms.. them heads have been used for years and years on 555+ ci engines and make good power.
Compression is plenty high enough to make power
Intake flows plenty of air to pull above 6200
So that leaves us with ... well you already know where ...
So back to wanting to see real data on a real dyno sheet .... or do you not have the sheets to show that ?
Another view at this ... maybe your not showing a real sheet because you know something on your end is screwed up and you need $ to fix it and want Naylor to pay for it ... maybe your trying to scam him out of $ ....
How does one get a super deal on a engine .. and then piss and moan after you cant get your shit together to dyno it where it should of been in the first place ... its people like you who ruin getting good deals for customers who aren't clueless ... its a real shame you don't do your homework on your entire combo, dynos and injection