Dude, this is a gotcha question. Some of us get a motor and trans for $2K, some for $12K, some pay for wiring, some don't, will your cooling system work out, or do you have to buy new, what about fuel? That problem alone can range from a few hundred dollars to several thousand. There is no hard and fast answers on budget, but I honestly think you will have a hard time doing a nice install under $12K if it is your first one, and you have to buy solutions. If you are a great welder/fabricator, you can save a ton of cash, though you will have a hard time if you insult people on here. We are a touchy bunch...
If you want a detailed cost analysis of our swap into a 67 Camaro, you can download our spreadsheet at:
http://hosted.filefront.com/67rsss While this isn't exactly everything for your swap, it is a pretty realistic cost analysis of a mid level swap (this is not exactly a Bad Penny type swap).