273 Coolant leak help

Steve, the timing cover and inside of the engine are VERY close to each other where the coolant goes through the ports on the timing cover.
It may very well be leaking where the block and cover come together, and it is even fairly common.
That being the case the head gaskets don't have anything to do with it, and a simple re gasket would seal it up.
It's also real common to be able to just tighten the water pump bolts up a bit and stop it.

I think you need to narrow that down, as it's hard to tell exactly where it's coming out from.
Could be intake, timing cover or head gasket, though leaking head gasket rarely leak that much.
Dry it off good and watch it REALLY close even if you have to use a mirror, but per the video it looks like the intake corner is what's leaking.
Can you tighten it down just a bit and see if it helps slow it down?