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Back when I was a Californian I did quite a bit of "testing" by getting 2 gaskets and putting a metal shim between them. There was even a factory block off plate for use on 49 state applications. This was when we had to pass a visual test by the CHP at roadside inspections. You might have to...

I agree. I would go looking for a vacuum leak. I have also had this happen with the distributor over advancing (worn advance plate, allowing way too much vacuum advance), and weak / broken advance weight springs.

You might want to think about just getting a new ignition switch (NOS MoPar would be best). While you're behind it take a real good look at the dash harness, and anything that has been spliced into it. Same with the top side of the fuse box. The passenger compartment side of the bulkhead...

Best cam I ever used in both 383s and 440s. Factory 383HP and 440Hp 68-70 cam. Crane made a Blueprint series at one time that was a duplicate. Great torque, great HP, great vacuum for power brakes. Probably wouldn't hurt to install an adjustable double roller timing chain set, and maybe advance...

Never have, but thanks!