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More than likely it was used on a small displacement, high RPM, extremely efficient engine. 360 cubic inches or less. Bigger is not always better... Not to bash the OP, but I would take the top port over the bottom one any day of the week, chances are it is a very highly efficient, high velocity port with every aspect of it set up for a max effort combination. The short side radius is a lot bigger than the bottom port for sure. The bore size wouldn't be as critical with that port it as long as it was 4" or more.

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The last set of W8 heads for a small cubic inch Comp Eliminator engine were certainly not as small as those and flowed over 400cfm. The Cross sectional area would have been around 4". A 280ci engine at 9500 Rpm still needs around 3.65"
My old CFE heads had a minimum cross section of 3.48", below is a pic of the port window of the intake manifold as a reference

For whatever reason, I never took a pic of the intake face of them

The pic of the heads that Brett posted are curious, would I hazard a guess at an RPM limited road race application? It would be interesting to see how they look against an Edelbrock head, but I doubt that Brett has any of those in his shop

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