Went to the wrecking yard today... bought two 5 speeds for $95 and looked closer at that engine I mentioned a month ago with the H75 head on it. This engine really intrigues me. This time I looked for an indication of the size cast in the block above the fuel pump boss. There is none What gives? It was in a B310 wagon and it didn't have any emissions equipment on the intake or exhaust. Not even any provisions for emissions except a pcv. It had a foil sticker with a bunch of Japanese characters on the oil cap. Japanese crate motor? I'm contemplating buying it just to learn more. Different head than I've ever seen, maybe a different cam and pistons?

Hey Chowdozer, in your wrecking yard travels if you happen to come across a set of A12A conrods let me know.
I'm in Melbourne and need to find a set, seems the most likely way I am going to get some is have someone post them out from the US.

If anyone has any other suggestions please let me know.

I'll keep a lookout. I don't make regular trips. Yesterday I had to burn a vacation day or lose it, it was sunny, I had some extra cash, and all the planets were aligned

If there is no number above the fuel pump boss, have a look for stampings on the flat bit on the side of tthe block above the dizzy. (or there abouts.)

Yeah my engine number (A14) is stamped into a flat bit just below the #4 cylinder. There are other flat bits and my A15 is stamped above and just a little forward of the dizzy.