Ken Heard can grind one with the correct intake duration, exhaust duration, intake centerline, exhaust centerline, lobe separation, overlap, intake lift, but .006" less exhaust lift than the factory spec 340 4 speed cam....
Seven out of eight of the factory specs dead on and one just slightly off... That's pretty close to the factory cam...
I don't think that there's anything else out there that will be that close...