It's an alum. small port factory intake used on marine applications. Needs some repair on the water crossover but all in all, a pretty cool piece. Notice it has no exhaust heating under the carb. Also, the runners are quite a bit different than a standard cast iron intake. The large carb mounting pad could easily be drilled for a Holley bolt pattern. With a little GM numbered Holley like was used on the 327's, it would look like a 'one of one' deal for the purists to scratch their heads over.
https://www.ebay.com/itm/CHEVY-348-...263518?hash=item3fc765975e:g:Np0AAOSwgGldIWPa
https://www.ebay.com/itm/CHEVY-348-...263518?hash=item3fc765975e:g:Np0AAOSwgGldIWPa
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