The reason it never appeared, or raced, is that it was never finished.
You may recall from the history books that bikes had a slump in sales in the early mid 1950s - and Nortons was a victim of that as much as everyone else.
AMC (AJS Matchless) acquired Nortons about then, and the Norton race shop was a VERY expensive luxury that eventually had to go. So Nortons, and almost evryone else, pulled out of GP racing at the end of 1954. The four project only ever got to a slave single cylinder unit built up for testing - and apparently first off it wasn't particularly powerful. It also had the oddity that the carbs faced forward, behind the radiator (yep, watercooling and DOHC) so that was going to be a problem if they'd got it on the racetrack.
Another of the could-have-beens of motorcycle history.
Not sure where the remains are now ?
Not enough to build a whole engine.
Info from a little orange booklet "Built for Speed" by Bruce-Main-Smith Publishing.
P.S. Remember that Nortons were quite a small manufacturer, so their racing achievements were quite remarkable given the incredibly small budget at the time - the phrase 2 men and a van comes to mind. These days, that wouldn't even cover the catering van costs of a minor GP Team ??