598
I just tore a 588 apart, made 825 on a mild cam, a flat top will give you over 10 - 1 if you get a cam with the right valve timing to keep the compression up. I might add I ran pump gas to make the 825 hp. (3.50 a gallon for gas ) lol. get some decent heads around a 335 - 345 , get the flow around 410/420 @ 700 with the smallest intake runner you can find, (I used an AFR) try a shaft rocker system, and give it some cam ,around .780 lift and run some duration around 270/280, get a 112 separation. and with the juice, you will make way over 1200 hp, or 900 on motor....just my experience..