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Can't help you with the intake but here's a link that has some good info.

http://www.1962to1965mopar.ornocar.com/poly318.html

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Contact Gary P he has been out front on the poly engine for a long time.400 h.p should be easy with the 390 or the 400 stroker.He even has roller rockers for them.

Camcraft also can grind cams for them.

The Weiand single plane was discontinued in 2002 and they have no plans of re popping them.

The cyl heads actually flow quite well but I only know one person that is putting any serious effort into them.The work has been slow but encouraging.He has the larger valves etc in stock.

Thinking of possibly doing one myself.It will be a bit pricey but it would be nice to have something different.