I always use the high volume pump, but not the high pressure pump. I think the high volume pump provides a safety margin that the standard volume pump may not. If for example you crack a rocker shaft, you will have an oil leak in the system. My theory is that the high volume pump will be able to pump enough oil to overcome that leak, but a standard volume pump may not. No way to test the theory, unfortunately. Or, in a worse case scenario, you overrev the engine and spin a bearing, or bend a pushrod so that a lifter pops out of the bore, developing an even worse oil leak. Again I think a high volume pump may save the rest of the engine.
Also, I always like to restrict oil to the top end, using a 0.070" restrictor hole in the oil passage in each head. I think this is especially important if you don't use the oil drainback tins under the rocker arms like the factory did, or if you have an intake manifold like a Victor that doesn't drain back well up in the pushrod area. The rockers don't need a whole bunch of oil, and anything you can do to keep oil in the oil pan is a plus, in my opinion. You hear a lot of people claiming that you absolutely have to have a larger volume oil pan than stock, that a high volume pump will pump the pan dry, etc. I've got 40 years of experience with running stock pans and high volume pumps that says those comments are BS, as long as you restrict oil to the rockers and use 6 quarts of oil in the system, plus a windage tray in the pan. Not to say that a higher volume pan isn't a good thing, because it is, especially on a higher HP engine. But for most folks, the stock pan, stock windage tray, six quarts of oil and restricting the oil holes in the heads will eliminate any oiling problems.
