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How many hp and rpm support the mopar 4" heavy duty cast iron crankshaft???

Hi, i from argentina, i have 398 supercharged dodge .....this is a good engine, but i have serius problems with the temperature.....we run on 8 psi of boost (root style) on a 8,5:1 compression. Questions: What´s timing is good for my engine wiht gasoline 97.5 octane, and what's timing for...