Let me be the first to say welcome to the best board on the net! Although I can't help you find a yard in the bay area, there are a lot of members down there who will no doubt give suggestions. I bought my engine through, a classifed in a little want ad paper. I got a 350 with a 350turbo hydro for $150. You might want to check them out. If you shop around, you can find engines that are out, and sitting on the floor. Good Luck
Joe