Very doable! Use this intake:
Chevy SBC 350 Cross Ram Webber Stack Intake Manifold Satin | eBay
It's a SBC manifold. You have to cut it in half lengthwise for port alignment (between cylinders 3 and 5 as well as 4 and 6) and add spacers plates (mount the two pieces of the manifold on the spacer plates). The spacers are necessary as the SBC is not as wide as an RB engine. The good thing is both SBC and B/RB engines have the same intake manifold flange angle (55°) - so spacers are easy to make.
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