After replacing the engine the A/C is not working?

I have the truck listed above that came to me in pieces. The owner took it to Toyota after it overheated, and the removed a head and confirmed it was warped, along with the deck. It was a puzzle to say the least to put in the donor engine. But it's all running. I then charged the A/C.

Let me back up for a moment. The A/C compressor was sitting in the bed of the truck upon arrival. The pulley would not turn. I installed it and used a breaker bar to free it up and it spun fine after that.

I charged it and the pressures were fine, did not really blow cold.

The customer said there was smoke coming from it a few days ago.

I hooked up the manifold and nothing showed. I took off the lines and they both popped off loudly! There was pressure!

So I put on a new compressor, measured and added PAG oil, rotated it, felt suction. Hooked up the manifold, and proceeded to add refrigerant. The clutch would not engage, nothing weird there, I jumped the relay, it engages. Woah, the pressures immediately went into vacuum! When the engine is off the pressure is equalized at 85 PSI according to the manifold.

Neither pipes are above ambient, low isn't cold. I can see refrigerant being sucked in through the sight glass even without the clutch on.

I admit i'm not an A/C tech, but I have recharged dozens of cars the same way and never encountered this.