Im not quite sure what the minimal compression for an b27 is but i know for the b25 mine is around 180. However thats besides the point. Whats important is the variance between the cylinders and that all cylinders have compression. It seems by your numbers that the engine should still be able to run smoothly (not like a diesel).
If i were you i would use lucas injector cleaner or seafoam to see if that will clean up the insides.