[109 v8 conversion wiring.]

Hi all, 

today I collect my 3.5 Range Rover v8 for my 109 restoration. Most of the wiring is complete but where it goes away from the engine to where I assume the ECU would go has been cut picture attached. Do I assume right that ECU would go on the end of these cables? A lot of the wiring diagrams I have looked at have different colour cables stated which confuses me a bit. Also what is this round plug for? 
Thanks,

Edward.

[Series 2a 109 V8 conversion.]

Hi all,

I have recently acquired a 2a 109 station wagon which I am currently in the process of restoring. I will be rebuilding it from the ground up with a new galvanised chassis and so on. I am planning on fitting a 3.5 rover v8 I know that you need a modified bulkhead and adapter parts to mount to the chassis and gear box but I still have a few questions which I can’t find answers for. 

The engine I am currently looking at has a flywheel attached and I was wondering wether if it was in good condition could it be modified to take a series pressure plate and clutch? Also I know that it will need an electronic fuel pump but what sort of pressure would work as the engine I’m looking at is a fuel injection rather than carburettors. 

Any suggestions or tips and pointers would be welcome.

Thanks.