There is no way in the world that I would run 1/2 or 3/4 groove main bearings in a 1000 HP drag motor, NO WAY
As far as what is supposedly written by a manufacturer about testing, maybe they don't want to make those bearings anymore due to the low volume we Mopar racers buy
I've put a lot of motors together, some of all brands, one Ford FE motor I refresh for a friend who loved and only owned and drove Fords had a Holman and Moody 427 side oiler motor that used a full groove on all the main journals on the crankshaft for oiling the rods full time, it also had cross drilled oil passage on all the mains also