So based on those numbers I take it that you have a 400 inch engine and standard port big block heads? That would give you a torque peak at about 5100 rpm.

If you increase the stroke then the torque peak will drop according to the chart. A 3.75 stroke makes a 451 so the torque peak is now at 4500 rpm. A 500 inch engine with stock port heads will have a torque peak around 4000 rpm.

An average bracket racer just needs to figure out what RPM they want to cross the stripe at, how fast they want to go, what RPM they are willing to live with or afford and then build the combo that fits.

With a standard port head you probably can't get enough piston speed to worry too much. The bigger the stroke you put in there then the lower the power band so the problem kind of solves itself.

If you go too big with the stroke then you'll end up with really high gears and you'll have some trouble getting the car to leave hard. But if it is a stock block you'll have trouble putting too big of a stroke in there so once again, the problem kind of solves itself.

If you just have std port heads then there isn't much point in overthinking this. A 3.75 or 3.90 stroke crank works pretty good and will make decent power. The power band will be low enough that you won't need expensive valve train stuff but you'll make enough power to make it a fun ride.