Justin - I bought the heads from Indy Cylinder Head, but I'm not sure they'd even have records anymore. I bought and installed 'em six years ago.
JB - I'll be using 1.5 roller rockers; I have them on my 305 already as well. Also, the ZZ4 is rated at 355 hp at 5200 rpm, and I will have a TPI on top, so this is not gonna be a screamer small-block - it's gonna be a torque beast that'll never see over 5500 rpm (unless I miss a shift LOL). Thanks for the info on spring sizes too. I have to look at the .pdf file I downloaded from World about these heads.
JZ - Thanks for all your great information. I am mechanically inclined, and would gladly take you up on your offer to learn how to do the work. Where is your shop located? I'm in Bergen County, about 15 minutes from NYC. Please PM me with your number and location and I'll see what we can work out.
Thanks for all the answers guys!