I thought of the oil pan also. I'm concerned about the differences pertaining to the "Long Block". External things can be swapped easily. I think the WH motor uses a short oil dipper on the connecting rod, which can be used on a deep pan no problem. The crankshaft is the big kicker. Verify that before diving in too far.
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Matthew B 
1972 129 w/hydraulic lift and head light option soon to be repainted
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