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I had a similar problem on our 383 chevy (yeh, ok Ford fan boys - lol) but also running an MSD 6AL.
Check out the serial number on your 6AL (682013 is the one to look out for - fake) - my issue turned out to be a fake 6AL - would get a misfire/rev limit type condition at 4k rpm+
bought a new digital 6AL - no issues. Worth a try to see if you can borrow a 6AL or other MSD CD unit to at least narrow the issue area down a bit
Google search for Fake MSD 6AL
good luck
rgds
Gary
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