Build Thread Enola- Finishing touches

Looks good Steve! I'm looking forward to getting mine on the road soon and feeling boost for the first time (in my own car).

I really can't tell from the video. If I were you I'd go grab a block checker tool ( head gasket check tool ) from a local parts store. They're a really good thing to have especially when we are boosting these cars.

Does the antifreeze smell like exhaust gas ?

That's a good thing. With the radiator not sealing the fluid can't build pressure. The pressure helps keep the coolant from boiling.

If the head gasket were blown the spark plugs would show signs. A compression test would also reveal a head gasket leak.

You could put the cylinder on BDC and screw in a compression gauge hose. ( take the Schrader valve out ) Hook it up to an air hose and see if it blows bubbles in the coolant. Bad rings and valves get checked this way, too.

I can only imagine what you've gotta go through to get to your plugs.

The easiest is the block tool. It uses alien pee to check for exhaust gas in the coolant.

Next easiest is to pull plugs and look for signs of coolant ...

Stick a scope in the cylinders to search for a " clean " one.

There are a bunch of ways to check. With you not running hot, misfiring, or loosing power...I don't " think " its a head gasket...

I got only this to add...
I had a weird instance back in 95 w/ a 460 that I learned about nitrous usage on. I had been beating on it for several instances before, running it on 93 octane, w/ 37 degrees timing, w/ a two staged nitrous system (two stacked super power shot plates,...set to the biggest power level). The day I took it to the track, It would suck the lower radiator hose shut when you winged the throttle.
But I went anyway.

The first test pass,...as soon as I hit the button for the second stage, it blew a freeze plug (an actual, pressed in steel freeze plug) antifreeze blew out under the tires, I almost crashed, and I completely fouled the track w/ coolant.

I had one of my friends go get me an expandable freeze plug from AZ, and I installed it at the track. Refilled the radiator, and waited till my match race got there.

The next time out, and during the race, the car again blew another steel freeze plug, and dumped water under the tires. I lost control, and hit the wall. Car was trashed.

I later learned that I was somehow lifting the head from detonation and was pressurizing the water jacket. The fact that the car was sucking the lower radiator hose shut had to mean that there was also some path for antifreeze to enter the chamber, even when free revved. That had to also mean that there was something wrong even before freeze plug incident....but there was no smoke or smell that clued me into that.

That was my "hard lesson" where I learned about Octane, Timing, detonation, and compromised head gaskets.

eeeehhhhh.... I'm the wrong person to ask because my advice is if nothing else seems off other than the low coolant, fill it back up, buy a new radiator cap, and drive it some more and see what happens. If you lose coolant again, then I'd do further investigating. My truck was doing something similar and seemed to have been fixed with a new radiator cap.