distributor and cam gear wear and damage is caused by many things which include poor quality material, incorrect mesh, incorrect clearance, poor finish, insufficient oil, and poor quality oil etc, however, it is never caused by increasing the amount of oil to them . . there is absolutely no harm whatsoever in increasing the amount of oil to the gears or the timing chain etc and it is something that some very big name engine builders that have a long history of building reliable quality engines have done for years and continue to do to this day, but there is harm in having too little oil go to them, its that simple, therefore as i mentioned drilling this hole is added insurance which costs nothing to do, and only takes maybe 10 minutes from start to finish . . you are free to not do this yourself but its wrong to imply that it definitely wont help or may do harm by decreasing oil pressure.
Although these gears did not have any excessive wear problems in stock engines, one thing people overlook is the fact that they are not using stock parts when they rebuild them . . a comp cam or lunati cam is not a stock cam and may very well be made from lower quality material than the factory one and/or the finish on the gears may not be as good . . the same goes for distributor gears on after market distributors etc and i know for a fact that msd has a lot of their parts made in china although i dont know every part they have made there, however i do know that they use one of the highest quality bronze gears available, but unfortunately, that means absolutely nothing if the placement of the gear on the shaft is incorrect or the cam gear is crap etc.
there are MANY stories on the net about broken distributor gears and cam gears, especially regarding comp cams for some reason, yet i have never broken, damaged, or worn out either of these gears in 40 years of driving and building engines, and i have in fact used high volume pumps in several apps AND bronze distributor gears, maybe i was just lucky and didn't get crappy parts, i just dont know
this being said, i now inspect ever distributor and cam gear closely and if the edges of either are razor sharp which they have been on a few, i dull them slightly, and if the finish on the face of the bronze distributor gears is not smooth, i will run it over a wire wheel . . i have known people that were have premature wear on bronze distributor gears, so the finally took the exact same brand of gear and ran it over a wire wheel but changed nothing else and never had another prob with it . . they then began doing the same thing on all the bronze gears they used in engines and never had another problem so there is obviously something to doing this on the bronze gears at least.
i also know someone that had a similar prob with bronze gears, and all they did was drill a hole in the galley plug and install a new gear from the same mfg and they now have around 20,000 miles on it . . these cars did not come with bronze gears and in this case, increasing the amount of oil to it did fix the problem however odd that may sound to some.
im not saying that increasing oil to the gears is a cure all for bad gears, however, my point remains, it can not possibly do any harm but it may help, so why not do it?