You can use your Heads, rockers, and blower. For the intake, the lower will not fit a 351. I know edelbrock makes a lower performer intake for the 351, not sure if those ports will match up with the typhoon (I know the typhoon is a knock off of the performer so it may). You are going to need new pushrods, head bolts, distribitor, oil pan, oil pickup. I don't think the hood will fit anymore either. Also you will either need to alter your accessory brackets from the 302, or buy an adapter bracket that ford racing makes. There is a sticky post at the top of this forum with good info about this subject.
As for cars with 351W, there are lots of them: Broncos, Pickup trucks, Econolines, crown vics, early mustangs, and I am sure I am missing some. My freind just bought a 69 351 W short block rebuilt for about 700.
Good luck,
Mario