I would look at the Powerbond PB 1112 SS.

The SS I got from Amazon actually had the black finish which I thought only came on the ST. All my pulleys lined up perfect. Dwayne actually put me onto these. Very nice for the price.

http://www.amazon.com/Powerbond-Balancers-PB1112-SS-Approved-Harmonic/dp/B003NECMNS

You can also find them on eBay.

'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119

"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"