Hi Malcolm,
Apart from a selection of spanner sizes you will also need a "pushrod comb" which will make it an easier job to replace your rocker box.
Can you let us know where you are situated? We might have other forum members in your area who could advise or assist you.
Also before your next reply can you press the "Caps Lock" button on your keyboard. At present you are typing in capital letters and in computer language this is the equivalent to shouting at everybody.
Beezageezauk.