[tubman]

That will be fine. I think that these days some people get overly concerned about oil because a few people had trouble with flat cams on hi-performance engines that probably had more to do with assembly problems than zinc levels. All commercially available oil has to meet a set of standards that are more than adequate for a flathead Ford (non-detergent oils excepted). I do, however, commend you on opting for 180 thermostats. A lot of people run their engines too cold. The quest for the highest reading on the oil pressure gauge and the lowest on the temperature gauge is not a good trend.