Probably haven't worked seriously on a B20 since 1990 or so but your big hassle will be the camshaft. Yank the radiator out of the way and you should have enough room to pull it. Other wise you can do all of the rest of that stuff in the car. Always hated working on the front of a P1800. If you ever want to see a Volvo service department come to a complete grinding hault, park one of those old beasts in the service drive. People will start working in reverse, making work for themselves, just so they do not have to go up for a job so long as that thing is waiting to be dispatched.

Mark