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 What ignition system are you running? what's the cureve? and was the cam degreed in? If so what did it go in at? Not that heads wouldn't improve your combo... but all done at 5K? Think there's more holding it back then the 906's 
MSD6AL with MSD distributor and coil, sorry bu don't remember curve or how the cam was degreed. Easy to check ignition curve (think total timing is around 38 degrees and that it reaches that at 2500 rpm) but a little more work to check cam timing. If I rember correctly it is set at zero.
Well, maybe I wasn't clear enough. I can rev it beyond 6k but you get the feeling that it isn't very happy after 5k. Like it gets out of breath.
I'm using a fresh 3 inch K&N filter with filter top, Hooker Super Comp headers coupled to 3" exhaust with Flowmaster 42's, no pipes after the mufflers.
70 W100 Power Wagon. 318 4-spd
70 Sport Fury 440 2dr HT
71 Duster 340
71 Charger Super Bee - 383/727
72 Charger "Sabotage" - 440/727 - Street/Strip
78 Warlock in beautiful patina
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