Have a look at this thread on BY
http://www.brick-yard.co.uk/forum/16cs- ... 52595.html" onclick="window.open(this.href);return false;
It describes the conversion from a 1.6 diesel, but should help.
In addition to the bits mentioned in that thread you will need diesel engine bars and mounts, bellhousing, flywheel, spigot bearing, clutch and slave cylinder, fuel filter with flow and return pipes, wiring, relay and box for the glow plugs. Modify the engine wiring loom. A non return valve for the brake vacuum, glow plug light for the dashboard, different circuit behind the dash for buzzer of doom. The battery will ideally need to be mounted in the engine compartment, and a new main cable from the battery to the fusebox at the front. Air intake pipe and elbows, and a means of connection to the air filter box (or a complete intake system off a 1.6 diesel). A special exhaust system to connect to the AEF exhaust manifold plus mounts etc. The front gearbox mount will probably need to be changed or modified. Diesel throttle cable (and modified too). I'm not sure if the petrol tank can be re-used, or if the rubber grommets, pipes etc will be suitable for diesel fuel. All coolant hoses.
I'm sure I've forgotten something in that list.................
It's much, much easier to convert an existing diesel than a petrol. To get all these parts it makes sense to buy a diesel scrapper to rob all the bits off. These conversion parts will cost a fair bit on eBay, cos the sellers know they are in demand. Even so it is a BIG project you're undertaking there.
Good luck!