Hi volume oil pump vs standard volume pump

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What make is your 270/276/110/53*overlap and what lift?
It dropped lobes so it's been gone since 2004. It was a Hughes HE2430AL, now obsolete. Specs were IIRC, 223/230 @.050 and with my 1.6 arms .538/.549 lifts; yeah that's correct. She ran an Scr of 10.9 with aluminum heads and cylinder pressures of over 180 on my MAC gauge.
I replaced it with another (also now obsolete) Hughes HE3038AL; 276/286/110/61*overlap, and 230/[email protected] with lifts of .549/[email protected]. TTIs and full-length dual 3inchers.
The first cam was the Mopar 292/292/108 and that one I ran at 11.3Scr and .028Q.. The later ones are at .034Q.. The .028 gasket was not up for it, so I switched to the .039FellPros and brought the pistons up to .005above deck. So I lost a tad of Scr, but gained pressure.