470 SFT cam recommendation (I searched!)

On the fence with this, i’ve read about these gains I just don’t have anyone local that I know of I’d trust to get the real 15-20 cfm.
Near Cleveland if anyone has recommendations. Guess I’d be willing to ship also. I’d love to do it myself if possible but am uneducated at exactly what would need done to the bowls.
I’m going to call around to racer brown and Oregon to see what’s what. Forgot to check jegs lately too.
Get a copy of David Vizard's Porting and Flow Testing book or look up.his Youtube vids; Powertec 10. He has a number of them that show porting. Charlie Servido? has been working on SBM 318 heads for David and Uncle Tony. He has vids and show what he has found.