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Edelbrock Dp4bSurprise! The oldest design produced the best average power of the dual-planes-of course we're only talking 1-3 numbers better, and that can be testing variance, but still, this thing wasn't at all bad. It's the first of the Mopar aftermarket dual-planes but has not been sold in many years. The DP4B designation means Dodge-Plymouth 4-Barrel, and the C4B (Chrysler 4-Barrel) is for 440s. This intake is most like the stock design, with the smaller of the two planes on the right side and feeding cylinders 2, 3, 5, and 8. The coil bracket is not in the stock location, but even so, many people who want an OE look use this manifold.
I compared a CH4B to an M1. My understanding is the M1 is the same as stock except for being made of Aluminum. The CH4B is about 3/8" taller based on my very scientific test (that's a 3/8 bolt under the level on the m1).