Well, there's a heck of a storm comin in, so I didn't spend a lotta time under the hood this morning looking for a casting number. The only one I found (right rear side of the block) said K66.
However, based on the facts that I measured the side covers and they're 6" tall and there is a water hose going from the inlet to the water pump, I'm gonna take a flyin leap and presume that it's a 292.
I'll find the casting numbers on a day when I'm not tryin to keep from bein blown into the next county by a storm.
Thanks for everyone's help.
Ray