273 rocker arm adjustment
This is a excellent thread!
I have 2 sets of 273 arm set ups. Both came with banana groove shafts. I'm surprised the are not all that way. In the process of cleaning them up in a tumbler now.
Also, I have a very old Mopar Action magazine where Erehburg (spelling) showed all the differences in the rockerarm set ups for SB. He noted that adding the oil-hole just like they did on the econo-w2 rockers to the 273's rockers would be an upgrade. I'll try and post more info once I delve into my Mopar-library!