Just to add my 2cents, and to clarify a common misconception, a longer rod does not make a longer stroke, at all. A 10 foot rod attached to the regular crank would still only travel 72mm, correct? What makes a longer stroke is the position of the crank pin. You can only "stroke" a motor by adjusting the actual distince the piston travels, no matter where in the bore that travel is occurring.
So, the common corrections made with a spacer plate have nothing to do with the stroke of the motor. If you're using an OEM crank, you're running stock stroke.
However corrections made with a spacer plate to accommodate an actual stroker crank has to do with stroking the motor, but only so far as the crank is creating a different stroke, not by the height the cylinder is above the crankcase. Typically porting is done to adjust and create the desired port timing. So if you feel you can just swap any 198X cylinder on your bottom end, you probably never finished your original design/build.
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