So, my apologies to anyone following this thread looking for bearing confirmation. The NAPA site only states a 'manual-4 speed', but doesn't actually state SM420 for the 6308 bearing, plus the recommendations is for the countershaft. I'm going to stick with the 6209-NR for the front main shaft and will post the comparison when I have them both in hand.

1948 Chevy Thriftmaster 3/4-Ton
Poncho "farming" in Ontario
Starting in the DITY
Continuing in the Project Journals
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There are only 10 types of people in this world, those who can read binary and those who can't.