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Not that much, maybe 6000rpm at 400+hp, but I've had bottom end oiling problems on B/RB mild builds before, particularly with oil starved rod bearings.

yes there is a prob w the oil velocity blowing past the #4 main & not being able to make the sharp turn & the 2 rods fed from that main losing their bearings from starvation. As you know on SOME builds it's been a prob. Several fixes, one is an oil bypass line in the valley to slow it down. Been away from BB's for a long time so I've lost track of em.(Got a 451 slowly coming together though ). Andyf would have some good info on this. You can drill each vertical crank to cam passage & screw in a setscrew drilled to 1/16" which is plenty of oil for the cam journals/bearings ex for the one that feeds the heads and to elim that one drill horizontally into the rear of each head then up at an angle to the rear pedestal & tap into the NPT plug at the top rear of the block & T off of it to feed both heads that way & restrict each head to ~.080". this will let you restrict all 5 cam bearing oil passages to 1/16" but the #1 concern is the #4 main which MAY not be a prob w your rpm but you're into it and it's at the point where this is the time to research/add it. Definitely finish checking/drilling the 5 gallery to crank angled passages.

live every 24 hour block of time like it's your last day on earth