Here is something that might help.

Mopar Engine Performance Guide: Oiling System - Mopar DiY

The oiling system isn’t as high profile or glamorous as heads, cams, and other parts. But as we all know, it plays a vital role in the performance and longevity of an engine. The oiling system touches all of those parts. Clearance is an issue for street cars and street/strip vehicles, so you...

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The A-engine oils through drilled passages in the block and heads to the ... oil from the pump to the bearings and other parts needing lubrication. ... The 273, 318, and 340 share one set of radii and the 360 radius is smaller.

 

If memory serve rite the A blocks had the tube rocker not a stud mounted like a Chevy. Oil comes up thru head and should come out the tube onto the rockers. Are you sure those are the correct push rods?

 

 

Number 2 and number 4 cam journals have oil holes in them which allow the oil to travel into the heads. Be sure to note the notch in the end of the rocker shafts. They need to be put back the same way for proper oiling. Little trivia here. You can use AMC oiling lifters with hollow pushrods and it'll oil like your Chevy. This is the de facto mod when putting the 90's Magnum heads on a pre-Magnum block. The Magnum heads use AMC style stud mounted rockers, and the do not have the oil passages in the heads, so they have to oil via the pushrods.