Holy thread bump batman.
For k10's look out for a set of Honda CBR600 carbs. They have the perfect spacing for the ports on the micra head. Just need the jets changing.
Never got around to fitting the home brew rev limiter as I picked up an Accuspark limiter off a mate for cheap and its a good bit of kit. They are pretty cheap on ebay too:
http://www.ebay.co.uk/itm/AccuSpark-Fully-Adjustable-Rev-Limiter-Soft-Cut-MG-FORD-MINI-TRIUMPH-/170896938915