I've run a bunch of stuff through my Olds. Brad-Penn is the most stable on the mechanical pressure gauge that I've found. I went roller, so I'm not up on its ZDDP content. I do know that Valvoline VR1 and Lucas Hot Rod claim to have enough for flat tappet cams. Run of the mill crap off the Walmart shelf ain't gonna cut it.
If it's an Oldsmobile engine, no matter what oil you use you'll wipe every lobe off it! Seriously, start up is the one time you want all your "ducks" in a row. BradPenn (Kendall GTX) is good stuff as are the others named. Hopefully you have a break in stand. Have cooling fans, fire extinguisher, good battery, go over all lines plus a Helper. Good luck.
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