I have ran a lot of different BB combinations, the 451 is a 440 stock stroke crankshaft in a low deck, it is the same as a 440 with .060 overbore. I ran one of those with a set of M.W. heads, intake and 750 carbs, we could slow that car down a tenth by moving the shift points in 1st and 2nd gear from 6400 RP to 7000 RPM.
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That was with a Isky 616-590 grind with all Isky valve train parts with the springs set up the way they wanted them
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My point is you will have to take the car out and try different shift points to find out what works best in your combination
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Converter, car weight, rear gear and trans ratio, tire size and so on all play a part on what works best on shift points
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BTW, I shift my 518 low deck pump gas stroker at 7300 for the best ETs