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Are all of your parts new or relatively new. I don't doubt that your having problems. I had a problem with all of my timing not coming in and it was a overtightened bushing nut. The smallest thing can cause big problems. My 6AL, MSD dist, and blaster 2 will spin my 302 at 6000rpm (chip) all day long.
When I wasn't getting full mech advance my dyno graph looked like you said. If you have a friend with a 6AL swap his in and see what happens. At what RPM is you peak occurring HP ? Put the car on the Dyno and have a friend do the driving and take a timing light and watch the timing through the whole run. You may have a bad 6AL or the mech advance may be stuck. I picked up 55hp with the timing fixed. Good luck
Later Dennis
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