The heads were worked by a reputable shop about 25 years ago. I've used them on several engines and they STILL perform fine. Nothing special about them... No porting or even port matching. 360 smog heads from a junkyard. They had the cast bosses for air injection, but they werent drilled. There is a big bump in the exhaust port on these smog heads, you might could grind those out for increased flow on the exhaust side but I would ask one of the sharp cylinder head guys on the board first. The manifold is just a stock cast-iron 340 square bore piece, although I've read that those are very good manifolds.

Like scratchn said, the 1.88" might be better on the street. I frequently revved that little motor to 6500 RPM without a problem.

These days I would do a Magnum head.