Frank;
I know another cobra owner that did the same thing on a brand new engine. He then drove it over 50 miles before he even hooked up the
oil pressure guage, then no
oil pressure. After he changed the lines he has driven it around 1000 miles with no trouble. I know of another one that was driven at a track event, turned up to tight, bent 13 push rods. This one had Motocraft
oil filters on it, they let the oil back flow though them. after I repaired the push rods & rocker arms, changed oil used Hi performance Motocraft, NO OIL Pressure, the lines had been reverested by the builder from the start. Changed lines, everything has been fine sence.
I would drain the oil and look. If everything looked ok I would drive it.
Poorboy