Hey guys,
I also just bought a slant 6 225. My plan is to turbo it and do custom exhaust. There was a set of headers on ebay a couple days back if used is the route you want to go. as for a turbo, do a google search for "turbo slant six" it'll give you a page for a guy who did a turbo setup for under $400. I'm using his info to make a custom setup for myself. keep us updated on your progress.
Oz