FYI, I put a 617.912 in my 80 240, used the origional 616 starter (starter that came with the 617 had a sticky bendix), and never touched the front end suspension. Car cranks, starts, and handles fine, sits level at standing. If anything sags, it's the rear when in gear/under power.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale