302 heads???

I have a 70 340 block bored 30 overs . i am looking to have a 416 stroker motor bulid for it . with a 904 trans build up also and i have a dana 60 with 4 link set up in my dakota . the man that bulids my motors said he can make any head flow well. he is damn good at what he does, thats all he does is bulid motors, http://s58.photobucket.com/albums/g254/rules371/?action=view&current=Video12.flv

This is my old 71 dart with a mild 340 very mild 10.5 pistons 484 cam 727 trans with 9 in 4000 stall 4.56 gears dana 60 . and my next motor is going to be on the bad side, best run was a 11.90's 1/4. so not to bad fro a mild 340