I hadn't seen this replyed yet but just making sure your not using a light weight oil? yes it will need zddp but if you are using 10w30 or thinner weight these flat tappet cammed motors where never designed to use a light weight oil (which also drops your pressure) as todays motors do. Check out Bad Penn 20w50 as Roger mentioned if not wanting to add zddp as an additive as its pretty economical. The old rule of thuimb I always heard is 10lbs of pressure fror every 1000 rpm's on a sbc, depending on what you want out of this motor, if its a occasional driver (no hard racing or high reving etc) you could step up to thicker oil and probably never have to touch this thing, I ran the same low pressure on a old pickup for 60-70 k miles or so as a daily driver (thats a long time for occasional driving) and sold it, probably went that many miles after I sold it! Don't get to alarmed just have fun Matt