If its in an original 383 car... No brainer, 451!

Be aware, however, that your Mopar crankshaft will likely have to have some work done to fit into a B Block. I can't remember if its the counterweights or the main journals, but the mopar "451 cranks are not quite drop in's. Sorta silly, you'd think Ma would know how to cook a 451 up???

Either way, I'd still go for the 451. The extra work on the crank will only cost a couple hundred bucks. The 451 is a slightly better motor, and will look correct in your Bee!