360 build need info on parts

As far as parts sourcing goes, first get a plan together on exactly what you want/need to do with the engine. This way you know exactly what you want and can compare apples to apples.

Then shop around: Check this site, Moparts, Summit, Jegs, PAW, and of course, eBay. Also try loacl Swap Meets especially mixed brand one - Mopar stuff is hard to find/sell at Meets that are heavily Ford and/or Chevy, don't be afraid to ask for a discount. Odds are the vendor has been "lugging around" the Mopar items for awhile.