Manifold: looks like I might go custom. A buddy of mine is fantastic with a TIG, and works for a machine shop, so the base shouldn't be too difficult. Know a source for intake manifold flanges???
I have considered the lower half (or cutting one in half) of a tunnel ram. The Gutsram
http://www.wenzlerengineering.com/gutsram.htm is a nice piece, worth every bit of $380... and I could unbolt the carb flanges, and make my IC box to sit on top. It's got the necessary injector bosses, too.
My IC will remain a secret at the moment. I'm pretty excited about how it might turn out, and I could possibly make them for resale as well.
I'd be interested in hearing more about your set-up (PM or post a link???).