Kurt, sorry I didn't see this sooner.
I used Ram Powergrip HD in my old '61 Pontiac. Has a stroked 409 to 474 and made around 575Hp best we can calculate. NEVER missed a beat in 4 years on the street. BUT also never tried it with a slick.
https://www.summitracing.com/int/par...illocation=int
Or maybe look at just the Ram Powergrip.....
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'58 Apache pick up
'78 Z28 4sp being restored
'70 W30 convert TRIBUTE
'78 Z28 32,000 survivor, Og Yellow paint, AC.
'69 CANADIAN Nova SS 396/350 hp
'67 CANADIAN Nova SS 427 10 sec. driver
'66 CANADIAN Nova SS Race Car
'61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD)
'31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW)
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