im doing the same conversion but into a mk4, i stripped a rs2k and kept all the running gear box, loom and ecu but decided to ditch the 2k gearbox as the price for getting the conversion plates made up and driveshafts was what i was willing to pay! worked out as more than a paid for a crashed rs2k! so im using a cvh box and just mating the 2k lump up to it. had a mate go though the wiring diagrams with me and im going to just feed the lives to the ecu via a seperate mini fusebox so that minimal splicing into my original loom as possible as it wasnt much good before as i put a zetec into it and the car was carbed before. mini fusebox cost be about £10 off ebay, is about an inch long and can take 10 fuses.
so what have you heard about the engine mount though as i looked at using a cvh one and found it near enough imposssible to use! easy on a zetc but not fo the 2k becausze of where the oil pump sits so am using the original mount and welding one up from a mk6 escort onto my chassis and then making up my own support bars for it. would be really interested to hear what you have heard about using the cvh mount.
am starting on the 5th of may so can let you know what problems i come across if you want.