ProComp/Speedmaster aluminum heads

I was just future trippin on trying to swap heads while the motor is still in the car??
I'm not sure even if I loosen the headers at the exhaust as well? Maybe have to lift the motor a little?
I might be waiting to pull the headers out for some paint touch-up anyways...
I've swapped heads many times with the engine in the car and the cheap headers. Really it's not too bad.... but if you want to touch up, that's a different story