In your case, there is no 'locking'. You need to put the crankshaft gear in the proper alignment as you want the engine to be ready to fire on number 1 when you are all done.
The locking tool for the rear of the cam shafts is needed to align the cams when re-installing them. This locking tool is required, you may craft your own or purchase one. The Haynes 850 manual has a write up on how to make one.
In addition, you will need a 'tool' to hold down the cam cover as the aluminum screws are not strong enough to force the valve springs when you glue the cover back down.
You will also need new head bolts, 8 of them I think. And a can of RTV glue, Volvo is best.
Be careful prying up the cam cover, it is cast aluminum and can break if forced too much.
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My back feels better when I sit in a Volvo seat
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