Richard clarke does conversion looms. Use the 12 valve charging and starting wiring and use his loom for engine management just needs earth and ignition live. Carb shells dont come with a return line and 12 valve lines slightly smaller bore. Will need to change fuel lines either from a ep82 or run your own. Needs a fuel pump fitted and wired up to ignition. Ep82 tank also a good idea as carb tanks are not baffled and pump can draw air. Thermostat housings will need some sensors mixed and matched for fan switch, dash water temp and water temp for ecu. If youre using a ep90 4e you'll need engine mounts swapped over from the ep80 12 valve. Exhaust will need modified, downpipe shortened and 4e flange welded on. Think thats everything. Handy enough if you have a donor car.