OOPS! I was thinking of the small block engine, which has three oil galleries, not two like the rat motor! Drill either plug- - - - -it will only slightly increase the flow past the lifters on one side. The 265-400 engines have a third oil gallery that runs down the middle and supplies the cam bearings and crankshaft, independent of the lifter oil galleries. That's the one I drill for extra cam drive lubrication on the small blocks if necessary.

I'm sure you probably know that gear drives are horrendously noisy - - - -I can hear an engine running half a block away and recognize that it's got a gear drive.
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!