440 rebuild questions

When porting stock heads, IME the bowls are the point of best returns per amount of time spent. Get a good valve job and straight valves, blend the bowls into the valve job, smooth up the short side and call it good. Recent 452 head I flowed, done like this, 237.5cfm I/196cfm E at .450 lift, with 3/8" stem 2.14/1.81 valves. Nothing special, I don't port as a profession, just my own stuff. S/F....Ken M