400 with 440 crank

old way was grind the journals down and then grind the throws down to fit. Alot of material off those throws.....You can use either long or short rod depending on what piston you want to use, they make both combos. Nowadays, you can get a cast 400 stroker crank for less than the machining of a 440 crank to fit, and they are plenty strong. 451 is a great combo, They could have made it a production motor easily but it would have stepped on the 440, probably on the 426 too with some good heads.