Jay.. Bit of both mate only want to do these things once

everything will be run by the master first

Ahmeds opinion was its a bit over kill but do it if you can afford it. not had an RS on a recovery truck yet
How much a 9" diff ? I thought the Ford motorsport ones where £2-3K

needs a different type of mount doesn't it? I've only ever seen 'grp-a' ones thou is there a lesser road version?