I always thought a B30 would be a nice swap. The big six from a 164E is the same as a B20 but with 2 extra cylinders. Offset rad, stiffer springs, and you'll probably want/need the power steering of the 164 too.
Should just bolt in!!?
Volvo Forums - Volvo Enthusiast Forum - Volvo Community - Volvo Repair
A forum community dedicated to all Volvo owners and enthusiasts. Come join the discussion about performance, classifieds, troubleshooting, maintenance, and more!