I bought a pair of the Edelbrock MW heads from Todd at compititionwedge. They have been cnc'd by Hughes and measure 330cc intake port and 76cc chamber. I use Harland Sharp rockers push rod oiled. You can get there rockers either way, push rod oiled or shaft. I'm using the heads on a 511 with a solid flat tappet spec'd by Dwayne 270/276@50-.644/.615-110 using 1.6/1.5 rocker ratio. Heads flowed 356@650 on up. Pump gas deal with 11.25:1 compression.