I hear all the Oooh and Aaahs!!!! BUT Only the Brits would know.......
You should see the throttle linkage rod that has to leave the central button shaped accelerator..... through floor..... go forward to the front of the engine..... then turns 90 degrees to the left and the shaft goes between the water thermo elbow and the top of the water pump......opnce on the left side the rod is attached to a long arm that goes down to be inline with the centrally located fulcrum pin that hold a bell crank with a rod going up to the carburetor....Carter W 1
Now when you complicate things by installing a water pump adapter plate to a 235 /261 ...sometimes you need to grind lightly the underside of the elbow to get a few mm of additional clearance.
One of the British spec was that the distance between the end of the steering wheel and the center line of the front axle was to be 13 inches. In the only joint effort that I am aware of...Ford and GM agreed to work together to come up with pilot model ( prototype model were not in the vocabulary at the time) After the initial 50 pilot models production started in the last few days of March 1940 but apparently they were all stamped April 40...... by Xmas 40 11,000 +- had been made and the British Expeditionary Force had been bumped out of continental Europe....leaving most of their new trucks to the German who salvaged them and fondly ran them for years........ everyone panicked and order for tens of thousands replacement trucks were ordered...... Ford and GM held their ground and agreed to produced the required numbers only if they were allowed to redesign the cab to the last model number 13...... they did....99% of the same power train was used but with a North American humanly designed cab that was more practical for our NA assembly plants... the rest is history and lots of treasures are still slowly wasting away in Brazil/Argentina.......
They are challenging tolocate, restore, service and drive ........but that seems to be the attraction.