Took the balance pipe, between the intakes, off and replaced it with two fuel injectors, plumbed into the high pressure fuel system (that is now controlled by the Megasquirt ECU). The throttle linkages and return springs were removed from the carbs and the throttles were jammed open.
The existing air plenum had a BMW throttle body fitted onto it:
With some MASSIVELY dodgy wiring (I'm using domestic screw terminal blocks to make things easier before it's all in place and ready to be crimped/waterproofed), got the TPS, IAT and CHT rigged up (CHT is measured using a EPCOS B57560G103F thermistor, JB Welded into a brass fitting that is bolted behind the Cyl #4 bolt):
Pressed the button and to my surprise, it fired up! With a bit of fiddling with the laptop, actually got it idling pretty well at one stage, although did have a massive cloud of oily smoke coming from the exhaust on one occasion. The great thing is that you can hear the ECU trying to stop the engine stalling and it idles much better than it did on the carbs (from cold, anyway).
Of course, I have a lot of tuning to do (haven't got round to fitting the proper carb replacements yet) but it's an encouraging start and once I've rigged up a throttle linkage, I should at least be able to move her around in the front yard
