Re: the build
You have to remember we are not talking OHV engines here, so with Ford factory heads anyway, flow is not a factor. The question is compression; the EAB heads have the smallest combustion chambers of all of the 8BA series heads, so (unmodified) they are the best choice. With some judicious milling, all flat heads can be made to have smaller chambers, which raises compression.
Of course, if you are getting into this, there is always the subject of modifying the heads to maximize compression and "quench" (which promotes optimum combustion). Ideally, you should get the clearance over the tops of the pistons to .045"-.050" which will maximize both. In addition to milling, his takes some work measuring the clearances (using clay or aluminum foil balls), and then some clearancing with a die grinder. In my opinion, this is the single best thing to do to increase performance (and economy) in a Ford flathead. This has been covered here many times, so the information of how to proceed is available.
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