There are new ones available. The best ones for a mild engine are the Edelbrocks. They make a single 4 barrel and a dual quad.
There are two different sizes for 348/409 manifolds. All 348's and any of the lower performance 409's used a small port intake. The high performance 409's used a large port manifold.
There are some new single plane intakes just coming out with both the big and small ports. They're really good on a street/strip or race 409
There are plenty of older intakes available in different configurations, like 3, 4, or 6 deuces. Most of those intakes look neat but give up quite a bit of horsepower compared to the modern Edelbrocks. Also, you can usually get a new manifold for close to what the old ones are going for.
Jeremy Grady in Peterborough has a bit of stuff for sale, I think but don't get me wrong that his intake is possibly a factory tri-power though?
Worth the call possibly...705 775 6337......Tell him Chris Stapley sent you..
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