Designed for 351M/400 Fords in one of the three following configurations: 1) OEM 2V carb and EGR system with suppleid 2V EGR spacer; 2) 4V EGR system with either an Edelbrock number 8053 4V EGR spacer, or an Edelbrock number 8017 and Ford number E4ZZ9A-589E 4V EGR spacer; 3) For off-highway use, non-EGR 4V system with an Edelbrock number 8714 4V spacer. Performer 400 EGR manifold number 3771 is a stock replacement/street legal part for 351M/400 2V V8s; 1974-80.