Marc,
unless it's a complete setup, I'd give it a miss, missing parts are very very hard to find and improvising isn't really a viable option. It uses a SU HIF44 carb modified for a draw through operation, you would need to ditch the Nikki carb currently on your car.
Have a read of this thread about a system that was on ebay a couple of years back......... I know who bought it and it never got used as far as I know.
viewtopic.php?f=21&t=672&start=10
Also, check out my build threads for my silver Elford and my old black car, you will then see the parts needed.
Basically, you need the exhaust manifold, turbo, wastegate, downpipe, oil return pipe, Elford modified sump with oil return, inlet manifold, oil drain pipe, carb mounting block, carb, throttle linkage, oil metering pump rod, pressure switches on mounting block, ignition retard system and the ignition monitoring module.
you can get away without the ignition monitoring module, I can tell you how to make up an ignition retard system, you can probably get a HIF44 carb of ebay but the carb mounting block and the Elford oil return to the sump are the deal breakers really.... if you don't have them then it's a real up hill battle and not really worth bothering with.