Lets go back from 66 to 1960.
Chevy turbocharged the the horrible Corvair spider motor and it lived 6 psi of boost with the aid of water and Alky injection.
My 2 cents is if this crap Chevy motor can live with 6 or so psi of boost then surly a 389 can live just fine on 8 psi, assuming forged Pistons and with the right tune the water Alky mix will not be needed.
Those 60s era 421 SD blocks that Micky Tompkins supercharged and feed nitro did not have cylinder walls all that much thicker then a production 389!
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