Haven't done the mount on that exact car but several similar ones. The arm is left in place, the bolts removed, the engine is raised then the mount is slid out horizontally with some finagling. The new mount is taller than the old so additional lift/room will be needed to get the new one positioned.

Lifting the engine with a 2 x 6 on the oil pan, I've done it but watch for any deformation in the pan. Putting a folded up towel or a piece of carpet on the board may help. Do not put your hands in any potential pinch points in case the engine shifts. I like to put a block between the upper oil pan and the center frame rail as a just in case. Watch the fan to shroud clearance, wiring and hoses in general for anything getting stretched too far or interfering with raising the engine...lift a little then look, lift a little then look until you get enough clearance.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer