How much is a running 360 engine worth ?

When I was looking for one about 3 years ago they all seemed to be in the $250-600 range around south east WI. After watching craigslist for a couple weeks I ended up buying a complete low mileage 360 with transmission from a running '77 charger for $450. Then I sold the trans and all the accessories and stuff I didn't need for $300.