so your escy runs the black box esc then? and coil pack?
you want this.....
http://www.ebay.co.uk/itm/FORD-ESCOR...item58a0eddded

then either £140 on inlet / 70 for bike carbs / 30 for a pump or £20 for a round top late xr2 carb and 30 for a pump job done. engine needs stem seals which are nothing and a new release bearing again nothing. guess you'll need a 5 spd linkage too which aren't expensive , even better a puma linkage about £25 on ebay. parts for the cvh are sooo cheap! and they go well enough for a daily driver.