I am somewhat certain that I have this right, that manifold was originally for a Pontiac but would fit the chevy. Notwithstanding, it was not a favorite because it did not work all that well. The carbs were too small as a result of the tiny tiny passage between the carbs. As noted above, turned the manifold into basically a independent runner manifold. So rare yes, but not all that good performance wise. The Dos Palmos intake being the better choice or a Clifford 3x2 ram if you needed one for race purposes.
