What's old is new again! Pontiacs have had a air gap since there first V8 back in 55. Looks like the runner area and full high rise layout should make for a great Intake for the 350 motor and I bet it pulls nice and hard up to 6500 rpm when paired with a 780 cfm Carb without giving up much bottom end! You can also clearly see how the Plenum and runners where borrowed from the Edelbrock SBC air gap model Intake to make the casting form.
There is a guy who does older Cadillac intakes that uses the cheaper Performance Products Mopar(Chinese) version.
it's nice work for sure, I know there is not alot of aftermarket intakes for sub, but I think that's because the stk intake disnt really cause any reduction in power in its setup and if the part you make can't add power it will be hard to sell. but with more ppl pushing the levels of our small block the need for better flow in the induction will be seen