Yes it's the Poly A Engine. 277-326 C.I.D.s. The 1957/8 Fury's came with a dual quad! Four barrels were made, mostly cast iron. 3x2 too: Mopar Poly Edelbrock P800 intake manifold | eBay
“Dual Fury V-800” Dual WCFB
1619826, 1822004, 1859229, 2206384 – Factory iron dual-plane 4 barrel “V800...