With this combination that cranking compression seems low.Were all the cylinders the same?Did you do a leak down test?This engine really sounds like a buick 455 i saw a few years ago.Ran and idled ok just couldn't pull hard enough.I loaned a good quadrajet of mine to the owner and the engine didn't have enuf ooomph to open the secondaries much at all.Cam timing was way off in this case.I have a nine way billet timing chain on my current engine.Any advanced or retarded position has to be checked as the markings are off a bit.Hopefully the new plugs will help.
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