Well It Leaks AGAIN!

Chasing a oil leak on a friends 400 chevy stroker. He thought is was bad oil pan gasket install. He re-did it. Still leaking. This thing has a star machine vacuum pump on it and it was STILL leaking! Leak down test was bad 60-70%. Pulled it apart nothing glaring, Off to the machinist to check the bores. Have you run a compression test on it?