Bitter taste of defeat! So much coolant in the oil pan.

Here's how fast the coolant is coming out:
[ame]https://youtu.be/Clz8dl-2SK4[/ame]

I put the water in with the oil pan plug out to get a better read on how fast it was leaking - it started coming out by the time I had poured in a gallon.

Unfortunately, the oil pan is back on and it sucked to get off/on with the engine in the car.

I can pressurize the front cylinders. It would seem that this experiment would be more effective with the oil pan off so I could look inside the engine, no? That's sort of why I was thinking it is time to pull the engine out of the car.

As for whether it is the heads, who knows.

Here's what I know:
1) Everything was fine before I pulled the engine apart to put in the new cam and 302 heads - no leaks.
2) The 302 heads were magnafluxed and checked out okay by a reputable machinist - he gave them back to me and I did some light porting/gasket matching. I brought them back to him for a 3-angle valve job, hot tank, and check for flatness - he took off 0.004" from each. He also installed the valves and springs.
3) I opened up everything and pulled out the old cam, put in the new one.
4) I managed to get the oil pan off as I wanted to clean out all the old crap in there and paint it. New oil pan gasket and re-installed (should have done the timing cover first but didn't figure that out in time)
5) Then put the heads on, using thin Mr. Gasket 1121g 0.028" gaskets. Head bolts were torqued in 3 stages in the order given by the book. The gaskets only go on one way and looked okay to me, although I stupidly forgot to take a picture along the way.
6) Upon re-installing the timing cover, I managed to forget the lower right side bolt that goes into the water jacket... unaware, installed the water pump and radiator, and had the first episode of coolant pouring all over the place. This is the bolt behind the water pump inlet.
6a) Realized my mistake and removed the water pump, put the missing bolt in, re-installed the water pump with a new gasket.
7) Filled her up with oil and coolant and got the engine started, timed and ran at different RPMs in the driveway for about 12-15 minutes.
8 ) Got ready to go for a test drive and then noticed the froth and dipstick level way to high.
9) Pulled oil pan drain plug and discovered massive coolant.
10) Freaked out
11) Performed the afore-mentioned test with the timing cover off and front of engine blocked/plugged up. Still leaked so re-installed timing cover and water pump.
12) Ruled out the timing cover and moved on to re-do the intake manifold gasket
13) Re-installed intake manifold gasket and repeated test, although this time front of engine was not blocked off but had the timing cover and water pump installed. Still leaked.

So it could be a bad head gasket job, a cracked head, could be a crack in the block, or could even be something ridiculously brainless I managed to forget that I cannot remember. Or something else.