I agree with Lee and others who have said that a 960 engine is the only logical choice for such a swap (if you were thinking about a BMW engine, for example, why not just buy a BMW) Due to the shape of the engine compartment, anything but an inline 6 (or a 4) would be very difficult, if not impossible to install. Not only that, but it would be FAR more work than simply replacing your existing engine with another B30, assuming there is indeed something serious wrong with it.
If your engine seems to be down on power, and its not just that it needs a tuneup, there are two likely causes: Older engines will develop valve seat recession from being run on unleaded gas. The cure is to pull the head and take it to a machine shop to have hardened seat inserts installed. This is not a problem on 74-75s as they had hardened seats as original equipment. The second possibility is a wiped cam lobe. Again, the head has to come off, and the cam and lifters must be replaced. Either one of these problems can be diagnosed fairly easily with the valve cover off. On older cars, it is possible to have both at once, in which case the car will barely run.
The BW 35 automatic transmission is a miserable device, that is inherently sluggish. If you have one of these, in an otherwise nice car, consider swapping the transmission to a 4 speed with overdrive. I've done this before, on a 140, and the transformation is amazing. You may also want to change the rear axle, if you do this, to get a better gear ratio.
You didn't say what year your car is. The engine output varied quite a bit from year to year. 72 was the strongest, though it requires premium gas. By 75, which will run on regular, it had gone down by about 30-40 hp.
The 164 is inherently thirsty. There is not a lot you can do about it. If you have a 4 speed with OD, you MIGHT get up to the low 20s on the highway, mid teens around town. Automatics are worse---they can go as low as 12-13 in city traffic.
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