Found some excellent pictures of the Corvette vs GTO (VZ?) crank balancers. Scroll about half to 2/3 of the way down for comparisons. I have the long nose water pump which is a relief. The "Y-body" balancer looks like the one that matches my PS/alternator pulleys.
http://ls1tech.com/forums/generation...vette-ls2.html
Some other P/S pulley options here:
http://www.howeperformance.com/accessories-pulleys.htm