Taking inspiration from a few posts here on ways to modify/fix the carb base and plenum using the A-B epoxy putty (POR15 in this case, identical to the Moroso and others available) here is the opening with the speadbore base ears removed, then a series of 1/8" aluminum pins pressed in to drilled holes, and the epoxy putty formed as one piece vs. multiple small ones. Along with the increased tapered surface area, the pins and sides roughed up for good adhesion, the putty isn't going anywhere. The roof of each runner was then raised about 3/16" from the opening and blended in about 2" into runners for an even better radius into the plenum.
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