I've never done a Falcon conversion before but I've pulled apart many of my Escorts, including rebuilding engines.
Its not hard. Just download the guide that MongrelEB put up and give yourself heaps of time to do it. Invite a few mates around and make a weekend of it. If you have the tools and a good guide/workshop manual then its a piece of cake really.
Thats a very good price. I would even call them back and ask them again, just in case they quoted you for a I6 conversion. When I bought my stuff, I chucked out the 6 cyl loom, bellhousing, clutch cable and clutch fork as all this is incompatible. Heres my progress with my car: 302 5 speed