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To me the issue is not as much the port cross section as it is if the long runner has to carry the fuel the whole way, if you can put the injector nozzles down by the intake valve (as close as you can anyway) all you have to worry about is moving the compressed air way down the rifle barrels, if you have to carry AIR and FUEL then a good bit of that runner column's volume and cross section (about 7.5% at a 12.5:1 ratio) is going to be displaced by the fuel where you really would rather have that much more room for AIR. The other thing is an injector will help atomize the fuel which will vastly improve the torque since you have a really bad short side in a conventional RB head.

The ultimate might be a standard port Chapman Stage VI head on a low deck block, this way you have a bigger valve, and a much better short turn radius all in a package that will allow the manifold to bolt up. The heads are still out there and they flow like mad (more than a lot of max wedge heads out there) for a 260CC port volume (which helps you as well) AND a standard port window that will mate up to your manifold. That turn radius and injector might make you another 80-100 lb/ft AND carry the torque curve way on up there, so you have a real win-win. That thing is begging for a 470" low deck with about a 6.8" rod (~1.23" CH piston with a d dish)

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