All the in line dual quad engines that Mopar built that I have seen all came with cast iron single plane intakes
Dodge, Plymouths De Soto and Chrysler all offered motors with in line dual quad motors, originally with Carter WCFB and later with AFB. All the ones I drove were doggy at light part throttle driving, I had a 1957 Chrysler 300 C car that I swap the inline dual Carter WCB on the cast iron in line 2x4 intake to a single 4 barrel dual plane stock intake and carb off of a 1957 New Yorker and it was way better to drive