Hey Pontiac, welcome, I would think one of the pros will come along and help you with the right answer, but I'll take a stab at it for now. The flow of any particular head is its strength. Some flow better/more than others. Valve size can be overrated in that the smaller chevy valves often work better on the street than the bigger 2.05 or 2.02's, BUT the 2.02's are there if you ever get the r's up and need them. Personally I just built a 357 (350+.040) with old 462 hump heads and put 2.02's in them. Nosalgia works for me.