Stock block plus 2.000 sbc rods, longset stroke?

Here is a piston velocity calculator. I looked at a 4" stroke and a 5.95" rod a while back and the 'normal' limit of 4500 fps was exceeded at 6700 RPM. A longer stroke and shorter rod is going to reach that velocity at a much lower RPM.
L&M Engines, Inc. - Piston Velocity Calculator