Commando 273 parts: Valve covers, intake manifold, pie tin, carb

Yes. Can't remember the exact story, but here's what I recall: We bought a '67 Cuda 10 years ago with a 318 block adorned with 273 parts. (Have since swapped in a 340, rendering the 273 stuff superfluous.) There was something about the 273 manifold/carb combo on the 318 block that created some type of height issue with the air filter. That is, the filter wouldn't fit... too tall. So the double base may have been a workaround to create some additional space.