ive got a landi renzo system here to fit to my mv6, any problems with wiring etc i have the pin outs for the ecu etc, pipe from front to back comes in two sizes, 6mm and 8mm, 6mm is ok for most instalations upto 190bhp and whats fitted to mine but is the copper type, for tank and vapporizer its normally compression or flared fittings, again sizes are pretty standard, the nozzles shouldnt make much difference as most lpg injectors are what are sized. just have to make sure the holes drilled right, saying that id of thought your one already drilled should transplant across to other, it is more a software issue you have that the ecu needs reprogramming to keep injector times open longer to allow a little more gas in for the bigger engine, not the end of the world and software available readily on internet, i use tiney tech for any bits when i do a system change as very good with prices
http://www.tinleytech.co.uk/acatalog/Spares_and_accessories.html is there catologue, any other probs i may of missed give me a pm, also tinly techs site has a nozzle size guide, some kits a 2.8mm fine others the 3.0 needed