Probably the front main seal. You'll need the counter hold tool to torque that front pulley bolt to the 350ish lbs of torque it takes. (assuming you don't have the special volvo torque multiplier tool). You'll have to re-time the engine so you'll need the dial indicator for the pump, but I think you said you already have that. Pretty much the only tool you'll need is the crank pulley holder tool.
Jason
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