converting >90 to 90spec wiring?

[Chris-White]

The title gives it away. Found a good mk2 shell, but its an 89 so obviously running the older loom and fusebox. Whst i want to know is how easy is it to convert to run ce2, using digifant1?
can the existing car loom plug into a 90 spec fusebox using the 90spec digi engine loom, or would it involve ripping the whole lot out, something i have no patience at all for?

failing that, does anyone do a plug & play conversion kit (if they dont, they should, would make a small fortune!)??

Thanks 

oh, and no suggestions of megasquirt / standalone, i have neither the money nor the knowledge to do that sort of thing at the moment 

[danny_p]

pre > post 90   engine looms on exchange have been threatend before

[rubjonny]

the whole car loom needs swapping, or you need to splice the engine loom into your old engine plug.  loom swap will take you a day at most