1,2, and 3 are running slightly lean. The others are normal. Look for a vacuum leak that might be affecting only the front cylinders- - - -possibly a loose or slightly warped intake manifold? I use an unlit propane or acetylene torch with just a little gas flowing from the tip to find small vacuum leaks. Pass the torch tip along the cylinder head/manifold mating surfaces, carburetor base, etc. The engine will speed up or the idle will smooth out when the gas finds the leaky spot.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!