I'd only do the crank pully if it's already failed. 60 bucks is a lot to replace something that may not have anything wrong with it. I'd do the front seals, and the seal carrier gasket if there is a leak in the crank area. It's too hard to tell which it leaking, and it's only a paper gasket. The big problems doing seals without a volvo seal driver are the seal's lips rolling and the seal being driven in too far. Both have brought customers to the dealership I worked at after volvo "specialists" did t-belts and front seals. if the tensoner bearing isn't smooth, or it's making noise, I'd leave it alone. It'll go another 50K, and I've done them with the belt on the car, so it can't be too hard. another thing that's important is re-timing the engine. the cam timing can get quite far off after a number of belt changes.
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cjregensurger@yahoo.com '86, '88 740 GLE; '88, 89 740 Turbo, '88 760 Ti