Are you using a Chevy pulley or a Mopar?

You might be able to find a junkyard special that'll do what you want, but if you're running an aftermarket aluminum pulley you might be able to find what you want.

If pulley & pump hub are straight I'd be tempted to put a spacer between crank pulley and dampener.

Sounds like a lathe project, but if you lay it out right and keep the center hole small till the last you can do it with a hacksaw, drill press and belt or disc sander.