The Commonly referred to as the world famous "Big Block 318", or "Wide Block 318" An "LA" intake will NOT fit a Poly engine...The intakes are WAY different...BTW: an original 4BBL intake for the poly engine will run around $450.00,,And the Dual Four version (1957 Fury only), will be even more expensive...Save your money and swap out that old Poly and repalce it with a later model "LA" Style 318-340-360...MY .02