273 Rockers on a 1971 340

sure the chevies and stock mopar have the shafts sitting in a bathtub of oil, not so with Iron or aluminum on steel rockers
I can remember customers who put restrictors in their blocks or even "better" in their rocker stands
and started burning up their balls, scoring their shafts, and overheating their springs, dry guides- they ruined a lot of good parts
and of course it was all my fault and they wanted me to fix it for free
see my lifetime warranty above
and I agree with YR HV pump is for low speed not high speed where the stock pump puts out more oil than you can use and HV costs HP
and restriction is on the suction side at high rpm