Around 1970-71 Volvo enlarged the tunnel on the 1800E and ES in order to accept the BW35 in addition to the already standard M41. My guess is that you’ll be OK there but I’m not sure if you’ll need a different crossmember to support the M41. I think you should find another set of threaded holes in the frame rails if the cross member needs to be relocated.
You’ll need to do something about the length of the front drive shaft.
It would be real nice if you could a donor car with all the proper bits and pieces.
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