Yes, the pushrod holes need to be slotted, and there will be somewhat of a pushrod tilt between the lifter and the short side of the rocker. No problem- - - -there's plenty of room, and there are no coolant passages in that area to be compromised. I'll be using the original rocker shaft connector oil tube to feed a drip tube with holes above each rocker pivot and a needle valve in the oil line to adjust the flow. On the later engines with the internal oil passages, it's a simple matter to tap into the oil gallery in the head for the same circuit. Just like with every similar "impossible" engine modification I've done it the past 60-something years, it's mostly a matter of "Measure twice- - - -cut once- - - - -screw it up and start over a time or two!" The naysayers can hide and watch.
Jerry
