My old autoshop teacher informed me to use white grease as an assembly lube. This was back before assembly lubes were really a "thing." Worked perfectly fine for me on several engines.
Flat tappet engines: Break in cam, change oil. Bring engine up to normal temp, adjust carb and timing. Seat the rings. Change the oil. After that, change the oil at 500 miles or a thousand, whatever makes you sleep well at night.
Roller cams: Start engine, look for leaks, bring to norm operating temp, adjust carb and timing. Change oil. Seat rings, change oil. 500 or 1000 miles, change oil again.
Cut the oil filter open after every change and monitor debris. Better yet, install a bypass oil filter before starting engine and use that as a guide for engine debris as well as MUCH better filtration.
I've changed the oil on a few brand new cars with 150-200 miles on the oil and the canister oil filter had metal shavings in every single pleat. Whether it's a rebuilt or new engine, IMMEADTILY CHANGE THE OIL!
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