Has anyone ever modified a 400/430/455 crank to install in a N/H?

For max stroke, you have to consider how deep is the cylinder(don't want the piston to come out the bottom of the bore), cam clearance in relationship to rod, pan rail clearance, cylinder bottom clearance, etc. Usually a .250 stroke is doable on almost anything, but beyond that gets tricky with a lot of "depends" along the way.