I was driving cross county back in my ramen noodle days (flat broke) and blew the 194 (that's another story) in my 1964 Chevy P.U. Found a very cheap 230 at a JY with burnt valves and was going to stick it in and try to limp the remaining 1500 miles home. Lucky me, it was only a bad head gasket. However, the block had a different mount for clutch linkage so I had to engineer, with a BFH, a mount out of the sheet metal base of a jack. Worked fine and made it home.
Granville King used to write a Gus's Garage type column for one of the 4x4 mags. One issue he wrote about being broke down in Mexico and having to carve a piston out of wood. Claimed it lasted for quite a while. As he was kind of a mechanical guru a lot of folks believed him, but he finally fessed up.
I supposed it would be hijacking your post to tell you about the time I put a drop-out third member in upside down. The result was one forward and 4 reverse gears.