Wise move with the test run. Beats pulling a head off a finished, detailed car. We did that on my brothers 69Z. A helicoil under a head bolt pulled just enough to leak water in a cylinder. On his 62 vette we had to pull the intake after the engine guy left the 1/4 inch plug in the oil galley which half the hole is under the intake and half not. Blew oil straight up and all over the car with the top done of course.
