Matt, all may not be lost. I've had a stovebolt chevy and a flathead Dodge engines that got a little too cold and cracked in the water jacket. In both cases, I cleaned the block, applied a couple coats of epoxy and they both ran fine for YEARS! The Dodge was in a dump truck that had a HARD life after this 'repair'. Today, I'd use JB Weld instead of epoxy. Run a low pressure radiator cap and don't let her get hot and I bet you can get a bunch more miles out of her.
