[Keithc8]

As Mike said we mill the name of the ends of the heads quite often. If the heads are not painted most people know they are aftermarket heads. I feel either head will do what you want.
We also do our own in house CNC head work and have we have done a set of the Blue Thunder High Riser Heads. They were for a race application and flowed very well. The flow at .800 was right at 400cfm and the exhaust was about 280-285cfm. The head has the standard exhaust port location and is the same on the Medium Riser head, we are currently working on the Medium Riser intake but should be in the 370CFM range. We port the heads for the application because you will give up some upper flow to get some lower flow and if you are only running a .600 lift camshaft you do not need the upper flow. This is why we have a stage 2 and a stage 3 Edelbrock head. We have made 700 with our stage 2 head and 850 with our stage 3 head. The new Blue Thunder FE race head should yield some real good flow numbers. We have a small block Blue Thunder head that flows 440CFM intake and 300CFM exhaust so I feel this is where the race heads will end up. Thanks and good luck, Keith Craft