422 dyno fail

As a check, maybe. But there is no way measuring and marking a balancer is accurate enough to move a cam one or two degrees. I’ll say it again, no engine builder worth a damn uses a balancer to degree a cam. And my original statement is still my main point, a bad balancer has no effect on cam timing.
Putting a motor together. I use a degree wheel. If I didn't have access to a degree wheel (or on a bet or dare lol) and had to use the balancer I'm pretty sure I could get it within a couple degrees. 2 degrees from recomended centerline is more likely to shift the power in the rpm range. Not loose the kind of power that this motor is supposedly down. Just so there is no misunderstanding I use a degree wheel when assembling an engine.