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?

Last edited by Dragula; 07/30/19 10:13 PM.
'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk