No Rocker Arm Oiling

When I went to adjust the valves on my 1964 American 196 (has 65 engine) I noticed, with the engine idling, only about half the rockers had oil coming out of the holes and the rest were dry. The engine was rebuilt 9K ago by someone else. I disassembled the rocker shaft and found half of all the oiling holes plugged and the rest restricted. Luckily there was not a lot of wear. My guess is during the rebuild the rockers and shaft were not cleaned. I had to use a drill bit to clean the crud out of the rocker holes. After reassembly there was a fair amount of oiling but no oil flying around. My question: is there a modification needed to get more oiling up there or is this oil flow normal for these engines? Looks like oil is supplied to the head via an external oil line. Guess maybe I should check that too.  Hot oil pressure at idle= 40psi. 

Well I may have found my answer by reading the service manual, imagine that! It states: "Intermittent lubrication to the valve train is controlled by metering the flow by volume through the front cam bearing." From there it goes through the outside oil line to the front rocker stand. 

And, as I found out when buying 196 OHV cam bearings ((Michigan 935-CS) only the 63, 64, 65 camshafts do this metering. They also take different cam bearings. At typical Ebay pricing they are close to double the cost. The front bearing has three oiling holes and they need to be aligned properly on installation.  The camshaft itself has a notch on the timing gear face that meters the oil flow in an obvious on/off fashion (see illustration below).

Edited by wittsend - Aug/24/2021 at 12:34pm

I just built a 65 motor and yeah, you really need to make sure that the cam bearing has the holes and that they're aligned. And the amount of oil to the top end, at idle, is alarming, if you're used to seeing the flood a full-main-gallery feed produces! It looks almost dry. I assume AMC knew what they were doing when they reduced the flow. It would be easy enough to move the source from the port to the main gallery (and plug that hole).

But why? The reduced oil is GOOD. My roadster runs full oil to the top end, and it's a flood.