HV pumps are generally needed where the bearing clearances are on the large side. Even a stock pump increases output with rpm, so just the fact that you may turn a higher rpm is not justification for a HV pump. Found out the hard way one time that you should run a HV pan with a HV pump. At high rpm the pump would all but empty the pan and start sucking air, most of the oil was in the top of the engine.

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70 Maverick Grabber, 5.0 (Performer RPM 2.02/1.6 heads, RPM intake, Comp XE266HR roller cam, Holley 650 DP, long headers), "Z" T5 w/Steeda TriAx shifter, 9" "N" case Trac Loc w/3.89:1, 31 spline axles.