Installing headers -- While engine pulled or after re-installed?

Scody21 said

Have the radiator out is helpful. It can be done with or without the trans attached to the motor. With it attached, you really need one of the engine adjusters like this
https://www.harborfreight.com/3-4-quarter-ton-capacity-heavy-duty-load-leveler-67441.html
I find it easier to pull the trans first.

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Thanks. Yah, I have a load leveler, so I'm good there. Also air over hydraulic on the hoist :) Makes life a lot easier. Now if only they'd come with a release valve that had more than the "hold engine in place" and "drop engine on floor" positions...