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David,
I think in my original post I said they were both 6.5". But on second glance today, as best as I can measure, my crank pulley is 6 3/4" and my water pump pulley is either 6 1/2" or 6 9/16ths, can't really get a good dead-on measurement and my large calipers walked off a few months back. Regardless, they are too close to the same diameter to achieve any overdriving. If you have a smaller OEM-style pulley, mine is exactly 2.5" in total depth, front edge to back edge. Shoot me a PM and we'll arrange to get it sent. There is no way this could do anything but help.
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I'll check my box of pulleys tomorrow, only question is the spacing of the four mounting holes and diameter of the center hole.......I have not worked on big blocks much,much less 427s.....
BTW: all my pulleys are single groove,old style V-belt....
David