Some websites you should know:
www.renegadehybrids.com has a complete kit to use a turbo engine for $2000. Since yours is non-turbo you'd be interested mostly in their radiator kit, which is $1000. It was developed for Chevrolet V8 conversions, so is proven, well done, and more than adequate for a naturally aspirated Subaru.
www.smallcarperformance.com do mostly conversions of watercooled Vanagons, Synchros and such, but a lot of those conversion parts are useful for the 914 swap as well. Especially interesting is their engine mount (for non-turbo conversions) which when you use just the side pieces lets you mount the front of the engine onto the stock 914 engine mount bar.
www.outfrontmotorsports.com are a Subaru into sand buggy specialist, but of course a lot of those cars are VW based, so their parts also fit pretty well with the 914 conversion. They also have good info on their website, are increasingly aware of these engine swaps into street VW's and 914's and so are interested and very helpful with information, etc. They have a lot more that what appears on their website, too, so they're good to call and talk with.
Search here for "Subaru", and once you sort out all the pointless debate you'll see some interesting projects. Also look at www.clubnarp.com , which has a subaru into 914 conversion section in their forums. It's not real active, but there's a lot of good information there, with good contact names. The Subaru into 914 group is still pretty small, so everyone seems very pleased to help others out with things. Lots of good talent, too.