I've been looking for an Edelbrock D-66, dual plane dual quad manifold for small port (273-318) heads for a long time. I finally found one and it arrived yesterday. Here is what puzzles me: It's clearly a D-66, It has the larger bolt holes and they are straight (not ovaled out). The manifold is in great shape and was recently powdercoated. But the landing for the intake bolts is obviously canted (not perpendicular to the intake mating surface) like for a 64-5 273. The reason I sought this manifold out for my 318 build was that it was supposed to be a direct bolt on for 66 and up LA motors. What's going on????