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Use a length of pipe over the handle of your breaker bar with the crank locking pin fitted rather than use the starter to turn the crank. However a 3/4" breaker and socket may be preferable. You should be using a torque wrench to tighten the bolt so will need to do that by hand anyway.
Are you aware that a new crank bolt is required to be fitted?
DO NOT USE THE STARTER TO TRY AND LOOSEN THE CRANK BOLT!!
A new engine will most likely be rquired because IF yhe bolt does come loose (unlikely) then the crank gear will rotate and allow piston to valve contact.
There is no keyway on the crankshaft.
And yes make sure that you use a new crank bolt.
Jc
Thanks Graeme & Justinc, I discovered the no keyway on the crank pulley when I got it off with a pneumatic rattle gun after I had the shaft locked with the timing tool & yes it could have been disastrous. I managed to lock the flex plate in another position as well by removing another inspection plug at the bottom of the bellhousing & gaining access to another hole in the flexplate thereby spreading the load. I was a little concerned with using the timing tool alone on the flex plate to lock it up with the tension of the crank bolt in case of damaging the flex plate or the tool.