My vote is for the Vortec heads with the following qualifiers - they need to be crack free and have a good three angle valve job done at a quality machine shop. So you'll need to take them in and have them magnafluxed and if they're okay, deck them, get a good three angle grind done, taps the studs and go with your new springs (and maybe a few valves?) and viola - great set of heads. Before you get the work done however; price the finished product and consider the next paragraph-

You may want to at least look at the offering from Edelbrock where you could get aluminum heads that are CNC designed and newer technology, close to the same flow numbers as Vortecs, new springs, guide plates, screw-in studs, hardened spring seats, stainless valves for under a grand ready to go. No muss, no fuss - See: Edelbrock 5089 - Edelbrock E-Street Cylinder Heads - Overview - SummitRacing.com

Just sayin'

Others will chime in - let us know what you come up with and welcome to CHR!
Glenn