Thanks for all the great information guys . I just got offered a Edelbrock Air Gap 7576 for a very low price from a Ford guy who happens to have one . He is going by the numbers on the box it’s in . I’m just waiting for him to verify the part number stamped on the manifold .Do you think an Air Gap on a stock 72 340 engine is worth it ? If not I may just grab it for later down the road when the engine needs a rebuild and I can build more of a performance based street bruiser .