I just listed a HyperPac Intake Manifold (P/N 2129898) for sale on EBAY:
http://www.ebay.com/itm/Mopar-HYPERPAC-Alum-Intake-Manifold-Carter-4-BBL-Carb-for-170-225-Slant-Six-/271251414031?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f27d81c0f&vxp=mtr#ht_67wt_1399
http://www.ebay.com/itm/Mopar-HYPERPAC-Alum-Intake-Manifold-Carter-4-BBL-Carb-for-170-225-Slant-Six-/271251414031?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f27d81c0f&vxp=mtr#ht_67wt_1399