New owner in Oregon--engine # question

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   Hi all-First, thanks for letting me join. I've been lurking and coming here for info for a while even though I didn't have a CJ. Until now that is. I've spent the past 3 years working on a 1959 wagon so much of my online time is spent over at OWF. 

After watching for most of the past 3 years, I finally found the ideal project for me. It's a 46 CJ-2A and was in the same family since 1956. The gentleman who had it fro 1956 to 2010 (when he passed) was Harry McNutt, and according to his son who sold it to me, this was Harry's baby. His son has a stable of Corvettes going back to 1963 and realized he would never have time to give his dad's Willys it's due, so he put t in my safe keeping. I'm over the moon.

This is the CJ in 1956 when Harry worked at the White Sands Proving Ground in NM.

This was last week when I picked it up at Harry's son's place. That's me on the left, his daughter on the right. 

It appears to have a factory replacement L-134, but the engine serial number has ne stumped. The casting is 908756, which I've read was a replacement engine made from 1954 to at least the late 60s. The same source said that most would have 4LRxxxxx or 3Axxxxxx type serial numbers. My engine serial number is 1MB43075. I've been through the CJ-2A database and there are only 10 908756 castings, and only one has a "1MBxxxxxx" number. 

Was my engine built as a MB replacement? Are there any differences between it and a replacement built specifically for a CJ-2A?  Any way to pin down the date better? 

Thanks!

Edited by Dahdo - 06 June 2022 at 1:13pm