help with 440 modifications

hi, how are you doing in your quest for power?:cheers: im in same boat, pre 70s 440ci,holley 750 vac sec,edelbrock performer dual plane,shumacker A body headers<are these restrictive?>dont want to remove engine,like to get decent cam and maybe clean up heads,{906}stock cam<idles 100%>unfortunatley not know compression ratio:pale: