Val, out of curiosity what are the metering rod numbers you have? and have you mic'ed the 3 steps? I keep a chart, the 2 step stuff is very documented but not so with the 3-step stuff.
Rocky...My metering rod number is "16-165" on both rods. I didn't mike them but I found out that they are .0635 x .060 x .053. I measured the rods with a number-drill template I have and the rods are very close to those measurements. The jets I have are "489"'s, which I understand are .089. I passed a .089 drill through the jet, a bit sloppy, but I think correct. According to the '67 Chrysler service manual, the jets are correct but they list the rods as "16-405". Not sure why.
I did find a pair of tall ones came off a 66 273 AFB, but are marked unreadable. I will see if I can get an orifice measurement. The tall ones are the replacement jet/rods for 3-step.