The AC compressor is hooked up, it's just a weird angle.
I listened real close with the hood closed and the center of the noise is right by the HB.
Thanks for the hose suggestion! The flexplate sounds fine but 3' of heater line is a whole lot better than a screwdriver, for sure.
Thanks a bunch, guys. I'll take everything apart to see about that harmonic balancer later this week. Looks pretty tight even with the mech fan off.