For a coyote swap budget at least 10-12k. But that'll make it look like it came factory in that car and run like a champ. You could do different junkyard builds with hacked parts for under $2k like the 5.4 or 5.3 (chevy). But you can usually tell they were just tossed in unless you spend the coin to do it right.
A coyote swap right now is going to be my route, but thats because it would be an awesome road racing engine. If you just want straight power, find a 5.4 4v. Toss it in, and turbo it.
You could build the 2v and make it nasty though with the right set up.