I used a 3 groove aluminum ebay crank pulley and an aluminum water pump pulley. The ATI damper I had was externally balanced so it pushed the crank pulley out almost 3/4". Just happened to line up with one of the grooves so everything worked. Honestly, I just got lucky.
These are the one I got lucky with.
Mopar Small Block Crankshaft Pulley 318 340 360 Crank Chrysler Aluminum A/C AC | eBay
Small Block Mopar Polished Aluminum Single Groove Upper Water Pump Pulley Dodge | eBay