Stalling after high speed

[John Middlesworth <jape@email.unc.edu>]

I don't quite have the HIF4 carbs perfectly adjusted on my 72 B, but close
enough.  It idles around 1000 and the plugs have the right grey-brown look
to them.  The problem is that it likes to stall after running at 55-60
mph, so that every exit ramp on the interstate becomes a scene of having
to restart the car.  Is there a simple fix?  Does this suggest I'm running
too rich or too lean?

John Middlesworth