On the 617 engine the crank/flex plate , or the crank flywheel is a match balanced unit. Not easily interchangeable.

I suggest you check to see if this is also true for the 616 engine assy.

Yes, do look at the filter location in the late engine and measure to your 115 engine bay space.

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'72 240D
'76 300D
'88 300sel
'40 Chev pickup , the shop hack.
'73 Monte Carlo Landau, for "Super Chevy Sunday"