Aftermarket Six Pack Questions?

I know this topic has been beat to death here. But let's kick the corpse down the road a little more.
I keep having this recurring dream (nightmare?) of seeing my finished (340) engine topped with a six pack induction setup. Stupidly expensive costs aside, it seems every time I begin fantasizing about this and price-checking, the scene has changed. One minute Eddy is making the SB manifolds, the next they are not, and they are "unobtanium". Same with the carbs. Right now, the only one selling stupid-expensive center carbs (new) is Classic Industries. Outboard carbs are nowhere to be found. Most of the used systems I come across on eBay are ridiculously priced and/or incomplete, or look like something the cat dragged in and are almost certainly NOT unmolested. I'm really leery about stuff like that. I would actually prefer to bite the bullet and spring for new components...if I could find them. So anyone got the inside scoop on availability? Can these components be purchased direct from Holley and Edelbrock? Are the big block carbs (way more available) too different that they can't be adapted? Help me get some sleep, please!