4-Banger Breathing

I would like to improve the breathing on my Model A.
I will be running a 94 Holley on an Ansen intake, tube headers, low back-pressure exhaust, Brumfield 5.9:1 head and a B-grind cam.
Will O.S. valve heads (approx. 1 3/4" dia.) be of benefit and if so, what application or P/N do I look for?
jea777@peoplepc.com

 

I bought my set from these guys....
http://www.antiqueenginerebuilding.com/valves.htm
Very good service and quality.
I ported the block at the same time, nothing over-complicated, just enough to smooth the flow.