Ted, checked my unmarked rockers today and they have no "B", or any other designation.  So, we may never know what these things are.  But they seem to work.  No idea of ratio, but that is not a big deal.     
Thanks, guys. Ralph 

Put a dial indicator on one of the retainers and see how much travel you have.  With your cam card, you should be able to see the lobe lift and you can figure out the rocker ratio from that by dividing the lift by lobe height.  Joe-JDC

JDC

Joe, I tried that, but my dial indicator does not have a stop on it, so I could not determine the amount of movement.  Tried with remote starter bump, but could not read either, as it was too crude a measure.  If I could get to the crank bolt, manual turning may be possible, but I didn't think it was worth the trouble.  Tried with caliper to measure between the center of the adjuster screw hole, to the center of the rocker shaft, but that was inconclusive.   
So, I will just live with whatever I have. 
Ralph.