In the background is the new Revell '50 Olds 303 (the basic engine looks much like the 324, 371 and 394 built thru '63) with the AMT 3X2 manifold from the '40 Tudor (which fits the old Revell engine perfectly),*snip* The angle of the manifold faces on the heads is correct
I picked up a partial '39/'40 Tudor kit for the manifold yesterday, and if this is as close as we can come to a multi-carb intake manifold sourced from a kit, we have some work to do. It's not too bad, but it is soft on the details, especially around the mating flanges, and there are those three ejector pin marks to address, the incompletely molded water neck, and the misnumbered intake runners (#1 as #6!?), but it does appear to be a replica of the cast iron GM manifold:

The AMT '39/'40 Tudor Olds 3x2 intake manifold:

An Edelbrock aluminum 3x2 manifold for the J-2:














