Rebuilt 318 install problem

I guess either or, but the sq drive adapter has to go. It has an area of just .141 sq inches, whereas a round 7/16 hole has .150, a 6.5% increase.. But, IIRC, I drilled close to or perhaps even to .500 which is .196, which is plus 39% over 3/8 sq. Overkill perhaps, but the leak is gone and......my engine lives!