I`ll go along with Patrickt and ENTDOC on the
oil leak location ... had the same problem on my 427 S/O Galaxie and found it was coming from the intake/head interface at the angle where the intake meets the head on the rear of the engine. It would still show
oil the next day after wiping down the night before . Like the others , a GOOD degreasing and then a smear/glob of RTV on the back of the juncture cured the problem . Good luck !