After completing the project I had a couple of issues with leaking coolant.
Turns out it was the new water pump I put in was slightly thinner and original bolt was inside the water pump housing butting against the engine block wall deflecting the pump body...
So I used the shorter bolt.
Since then I got about 1 year of use of the pick up truck....the engine was so loud the motorway travel was impossible without hearing protection.
Now it is used in a farm owned by one of work mates.