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I just spoke to an engine builder last weekend that swears by Comp Cams oil additive to make up for the lost ingredients in most of today's oils. (i.e. Zinc, etc.)
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I would not use the sybthetic oil at all. Most modern synthetics have no additives that are necessary for older engines with flat tappet cams as they were primarily designed for moderm engines with roller valvetrains and such. You want an oil with good "cling". I would recommend Valvoline VR1 race oil and a bottle of Comp additive. Fortunately, in this case you are dealing with a car that even though it's relatively old, the valve spring pressures are modest and the parts are already mated. I guess one area that could be a potential hazard is if a lifter stuck in the bore and failed to rotate. That would flatten the cam in no time.
MB