Not too long ago I did the heads in the Vette, so unfortunately, I'm all too familiar with this rebuild. Well, that's one of the reasons I decided to run two cars with the same engine. Swappable parts, and the projects repeat so I learn from experience. I just wasn't expecting to have any head problems on the blazer since the engine is so young (maybe 60k miles by now) Oh well.
I may take this opportunity to throw some long-tube headers on it, but so far, it looks like there may not be any "off-the-shelf" long tube truck header that will work with the LT1 heads... more research to do...