that kind of stuff sounds fugly! good that you fond it.is this going to be a gasser style car? fe engine?

Could a Chrysler rod be used? You’re probably special ordering pistons regardless, just use the Chrysler pin size.
It seems to me Chrysler Rods are right in the ballpark for length.  Pin was maybe 1.094 or something diameter.  I understand not wanting the bearing speed associated with the Chrysler, however I did see one go pretty good once.

I am no SOHC guy, but I would be less worried about stroke and more worried about that much cut walking the oil feeds toward the outside edge

Although wouldn't be taking the full amount off the entire journal, it's quite a cut in some areas. I don't have a crank in front of me to see where they clock, my guess it would be about 1/2 the cut at the oil holes, which should be OK, but depends where they drilled them

Tomorrow, (Saturday) is the last day of the auction.
Be sure to bid if interested

The original brake master cylinder’s output fitting does not seal, i.e., it leaks.  Teflon tape does not let it get tight.  It took me a couple of hours to pin down that the fitting has a 3/8-24 bolt thread, not a pipe thread.  And this thread is also used by the smallest 3/16” brake line fittings (tubes).   However, there is nothing inside the master cylinder port for the fitting to fit against, so it doesn’t seal.   It is not a metric size, but the threads almost match an M10-1.25 bolt. 

The fitting apparently was made by someone as it seems to be two fittings brazed together.  It only has  a threaded length of a quarter inch.  The port is 3/8” deep and threaded.  The master cylinder casting marks are US Brakes but I cannot find them via an internet search.
 
I think I will disassemble the master cylinder, drill and tap the port for a ¼” pipe fitting and then bush it down to use 3/16’ tubing.    If this doesn’t work then I’ll just replace it.