Thanks for your quick and comprehensive posts.
I have had problems in other applications with iceing and we dang sure don't want to go there again.
Interestingly, this engine runs great when it's cold. Just seems to want lots of gas to start.
I think I'll start with the stock intake/rochester plumbed to hot water (or not) and the Langdons into a single giant glasspack.
Maybe later try a 4V setup.