Turns out that the heads are screwed. Cheapest option now is to replace the whole engine. On the plus side though, I can rid myself of any of the remaining problems that the engine has by doing it. Problem is that it's still more expensive than I'd like.

So far, the cheapest I've found, purchased and shipped is almost $1,100. Not sure how much it'll cost to put in, but it's probably cheaper than replacing head gaskets.

*holds up a sign - "Will draw porn for monies"*