This is the setup on my 3.4 Mk1. Provision was made to fit a 3rd carb at a later date; never happened!. The rear carb fouled the clutch master cylinder, so that was replaced by a horizontally mounted one from a Ford Anglia. The clutch was then so heavy, my girlfriend couldn’t push it to the floor. The front carb fouled the inner guard, so that was cut away. The heap ended up producing 1\4 of the power it, should, did 8mpg and, if you accelerated using more than 1\4 throttle, would spit back through the carbs so badly, that, at night, you could see flames flying out through the wheelarch.This in the midst of a fuel crisis during which petrol stations were closed fom midday Saturday until Monday morning. Needless to say, I refitted the SUs, sadly very much poorer
, but also very much wiser. In my defence, I was only 18 at the time, but since then, all my Jags have been left strictly stock.