Another anomaly on some 265 engines is that there is only one position for the distributor housing. Instead of having a groove all the way around the housing that aligns with the lifter bores, the early distributor had a flat spot which had to be clocked correctly. If the housing was installed wrong and the plug wires moved to compensate, oil flow to one bank of lifters was restricted or shut off entirely.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!