Old post but kinda interesting, apparently www.TheBlowerShop.com might be making manifolds....
NOTE ALSO:: THERE MAY SOON BE A VERSION FOR THE POLYSPHERE (POLY) MOPAR ENGINES ALSO SUCH AS THE 318!
THAT SHOULD MAKE SOME OF YOU MOPAR GUYS HAPPY TO GET SOMETHING FOR THESE GREAT, BUT MOSTLY OVERLOOKED POWERPLANTS