I checked E-bay and don't think I'd like to go that route - just as expensive and more difficult to return. I called my machine shop to inform them and Pat, the owner, said the shop that does their crankshaft work could get some KBs. She'll call me back later this week with a price.
You'll all be happy to know that I've decided to keep my Challenger, so ya'll can put away your pitchforks. I went and looked at the Valiant after work today and it's a sweet car. If I were looking for a project or had more space and a more supportive wife (did I just say that out loud?), I'd grab it. But, I'm not and I don't and, like Kenny said, I already have most of the parts I need. (Though not so many as you might think - lots more engine parts to get.) It was tempting...very tempting. I really knew I wouldn't get it, but if I didn't look, I'd always wonder. If anyone is interested, the car is definitely worth the money.