Here is a link to a webpage I ran across once upon a time.
Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water
It shows not only stock head flows, but aftermarket and reworked heads as well. In addition, you can launch from there to the home page which has some cfm requirement, horsepower, etc calculators.
As far as the Edelbrocks, they are a good starting point. Consistent quality castings and machining. When I first swapped my iron heads for them, I did a basic port match, some basic cleanup, and reduced the bosses a bit. I agree, get them bare, and build to suit your needs.
Then I bought another pair of iron heads to put back on my iron block, so I could use the Edelbrocks on my aluminum 427. But first I had KC put big, pretty holes in them
KCs stage III w/ 11/32" valve stem diameters. 2.25/1.75 valves. I would recommend KC from start to finish, as he provided and installed the valves, springs, titanium retainers, etc for not much more than what I would have had in parts alone.
I guess the point I am trying to get across, is get them, they are relatively easily to modify for your application. You will also want to compare combustion chamber sizes vs. what you currently have.
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