TBI is probably the simplest system to install on an intake that was not previously designed for injection in that it can be bolted on to any old 4 barrel intake with an adapter plate. To run it, you can snag a computer from any one of millions of mid 80's vintage GM trucks, vans, and passenger cars. The wiring inputs are just the MAT, MAP, CTS and ACTS, along with the TPS. The stepper motor is the same one on the Rover EFI! You will need to run the return line to the fuel tank and get a low pressure fuel pump (TBI runs best at about 14psi) Since it is no larger than a carb and takes the same 5 inch air cleaner, you can fit it under the bonnet no problem.
I had one set up on my boat which ran pretty well. I used a Megasquirt to run it. Triggered it off the coil. Dead simple.
Small gotchas include: fuel inlet is metric inverse flare. There is a conversion fitting that allows you to use AN type fittings, which is what I did. Fuel outlet is also metric inverse flare but smaller. Be sure that you get a TBI that has these fittings still attached or you are sunk. Throttle linkage; I used marine Teleflex ball and socket that will also work with the Lokar type that Jegs sells. Vacuum lines...I plugged most of them. I found a website that showed what they were all for, but I lost it. Sorry.
Fuel pressure regulator is built in and non adjustable. You can get an adjustable type if you want to be fancy.
I got a lot of my stuff from http://www.cfm-tech.com/
I do not recommend using the Rover injection system other than the intake parts. The better way is to use the Megasquirt, 24LB Mustang injectors, an adjustable fuel pressure regulator, High pressure Mallory fuel pump, GM type sensors and be happy. Deleting the hot wire thing will let you use a K&N intake filter, lowering restriction.
You'll have to buy the Megasquirt 2 daughter card to enable the MS to drive the stepper motor, and use the Hall effect distributor. It isn't a difficult conversion as long as you have all the stuff. Plenty of help on the Megasquirt forum for Rover specific issues.