I seem to be reading that that all these engines B21,b23f, and b230 have interchangeable manifolds. It seems that the 85 on may not extend down to the bottom as much. All the header pipes in Art's photos seem taller from 85 on.

If a 79 will fit an 84, does it have the same O2 sensor mounting in the back? The guy with the parts car found my cracked manifold on my 84. I had no idea. That was the wheezing noise I've been hearing when accelerating and thought was the plugged cat.

Thanks,
Steve