I have seen a LOT of Mopar engines just plain RUINED by "tube and peen lifter bores" and drilled out passages
I have NEVER EVER seen a Mopar that failed because it was not drilled out in some way--never seen it where someone could prove that was what happened all that being said I am a 9/32" man when a hole needs the crud knocked out of it
Honestly all that stuff is just where old 4 speed guys were grabbing at straws to keep the crank in one when they were turning them so far beyond what they will stand that is was not funny--a good restrictor every now and then will help-- a bigger hole in a stock block eehhh...
Just my opinion--keep on drilling and screwing them up if you want  My Indy SR headed 7200+ rpm 446" wedge is a stock '72 440 block out of an Imperial w/ no drilling to any passages. Ran the snot of it for 3 or 4 years w/ no trouble at all. Bearings looked great when I freshened it up. It does have a Milodon single ext. p/u oil system on it...same setup I use on my hemi.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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