UPDATE: I called Steve (see below) and he had a perfect engine for me, a 1985 Buick 3.8L for only $199.  Unfortunately, I waited until Saturday to go see the engine and it was sold by then!  However, someone else responded to my Ad.  As part of a parts liquidation they bought, they have a pair of rebuilt heads that are exactly what I need.  So, this should work out perfectly (I should have them by Tuesday and will provide an update then). Hopefully, this resolves the issues with my engine!

(03/25/2010) I placed a I-need-heads-for-my-buick-v6 ad on Craigslist tonight.  I got responses right away. I also located an engine (and tranny) for $125, a brand new rebuild engine in Kennewick for $500, and a running engine in Tacoma for $100.  It’s been a good day for parts hunting!

Steve contacted me. He’s local (actually lives in Eagle, Id).  He’s liquidating a bunch of rebuild motors with new re-manufactured blocks.  They are all being sold for $199.  You can read more about these motors here: http://boise.craigslist.org/pts/1650718277.html
If you like something you see in that list, let me know and I’ll check it out.