I assume the large plastic windshield cowl is removed? That is a job in itself, with the wiper motor, wipers, and various 7mm & 8mm bolts holding all the pieces in. Have to be gentle with the plastic lines for the window washers.
If the new booster isn't painted, paint it before you put it in. The one I got from AZ was oiled metal, which rusted up in a couple of months, and looked like ass.
If the booster was leaking, check the master cylinder; typically the Master leaks brake fluid into the booster, which eats the rubber diaphragm, making it leak vacuum.
While you're bleeding it later, I recommend you "gravity bleed " it for awhile to run a quart or so of brake fluid thru it, to get rid of all the 20 year old fluid. Bleed it until the fluid coming out is completely clear.
You'll be amazed how much better the pedal feel improves.
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