Machining head will ensure head/block surfaces are both flat so that when you slap new headgasket on it so it actually seals, otherwise it's a waste of time -...
^ not sure exactly what you mean by 'the lock', but your reverse gear may be a bit worn. Try moving shifter into 1st, then into reverse (with clutch in whole time) and you should be able to drive...
When i did my old panasports I just torqued them all up evenly (working my way around from opposite to opposite) to about 'wrist tight'.. without putting any effort in from my arm. Very accurate I...
Even if clutch is worn beyond use, he will still be able to put it into gear - it will just slip and he won't get far. I would be checking slave/master for leaks and normal operation before...