Found my dads original 1971 duster!

RustyRatRod said
That could be your whole entire problem! You need to pull that timing up to around 16-18 idle timing instead of 4. 4 is ridiculous.

Oh really? I’ll double check. I’m sure that’s what he said. Dos it matter than it has a cam and has added hp? I think it’s around 390 hp