Hemi heads, for a mild engine flow pretty good. Out of the box MP heads usually flow around 375cfm which is more than my EZ1 Indy wedge heads.....Should be able to make over 700hp with them....
Your cam is holding you back more than anything......Port matching helps, what intake and carb?
I am running an MP “marine” dual carb dual plane with two 750 Hollies
