Try Inliners International for the casting numbers, which will get you close (there's some overlap on 230 and 250 blocks). The 235 and 292 will stand out as different. The 235 is a different engine design, no parts interhchange with the 230/250/292. That one was discontinued in the US in '62 (some '63 4x4s may have used them, though). The 292 has a few differences from the 230/250, mainly the feul pump is in a different location, and the block has a taller deck hight. Otherwise, they are very similar.
If you have the stamped serial number from the pad next to the distributor, you can post it here to get it decoded.
