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The first link http://www.moparengineswest.com/Stampings.htm . Lists the 2406516 as being used on the 361/383 engines. I found out that they also used those heads with the 426 street wedge because they could not use the Max Wedge's heads on them because the exhaust valves would hit the block. Unless you notch the block and that right there is the difference between the Max Wedge and the more streetable 426 street wedge. Max Wedge Blocks 2406730 castings and 2532230 with notches for the larger exhaust valves clearances and 2532230 without the notches for the 426 Street Wedge with the smaller exhaust valves found on the 2406516 heads. Big differences in heads too between Max Wedge and Street Wedge as the Max Wedge heads did not have heat crossover compared with the 2406516 which has them and were used on the Street Wedge for quicker warm ups in cold weather. Here is a link that will explain it more. racehemi.maxwedge.com/topics/castings.php