I run high volume pumps on every SBC I build and never had a problem. Good pressure at 7000 rpm on the wilder ones. Just clean up the drain back holes in the block and heads. Painting the valley helps too, maybe, never done it but heard lots of guys swear by it.
Chevys have a little bitty pump stock, anything is an improvement. The hi-vo pumps don't flow any more than a stocker once the relief valve opens, the main benefit is at lower revs before it opens.