Like the others said re the clutch master and slave. Also if you have to keep driving it while it is not right, turn the engine off to shift into 1st and reverse, this stops the grinding and will save your gearbox. Also pumping the clutch (like brakes) can get you around for a bit if the master or slave is failling. Changing the clutch is easy, you don't need to order from ipd any decent auto supply store can get you clutch, throwout bearing and pilot bearing for this (i,m pretty sure it is the same spec as the 240 series, maybe not the throwout though?).
As far as the o.d is concerned, generally the donor car will have all the bits you need, shortened driveshaft, x member, speedo connection with a right angle etc.. If not it gets a little more complicated, but any volvo with o.d. up to the 75 240 has most of the bits you need. No special tools needed, just the most special tool, a brain of sorts. Patrick.