Its all about time, I bought a good running long block out of a 70k mile wreck for $850, and I had a serious moment thinking about selling it when the last one on ebay sold for as much as it did (thinking it was $1700), but then I would be at 928Intl buying a short block if I wanted to build a hybrid.
FL has a LOT of old 928's, you should be able to find one if your willing to WAIT ....