Re: 1938 trans
The 8A-7113 cluster gear does interchange with the 68-7113 and the 51A-7113 and the 8M-7113. All four have the same tooth count. To use the 8A-7113 you only need the loose needle roller set, the longer spacer tube inside, and the two little thin spacer washers. These pieces would set you back maybe $30 or so. We have these in stock if you need them.
As you're learning from helpful comments above, you had some other parts to change out. A stock 38 trans would be able to keep a few parts when going to open drive, but not a great amount: cluster gear, low-reverse gear, reverse idler gear, countershaft, and idler shaft. The rest must come from the 1940-48 types. Even though the 1938 main drive gear has 16 teeth, and the second gear has 22 teeth, you can't use those 38 gears for your conversion. Same with the synchro assy.
I'm generalizing a bit here, but wanted to let you know that this project is doable if you've gathered up the necessary parts.
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