I have transplanted later engines into early bodies and visa a versa and maybe I was just lucky but I've not run into problems like you describe. #4 problem concerning the temp sensor which could be because the early 616s had two sensors in the head (GP relay, I think and cabin gauge) and the later cars had only one, for your cabin gauge. Hope this helps

Check your grounds which you prolly already did,

Edit..Noticed you are talking 617, but I would think the temp sensor would apply.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"