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The Hundreds fitted with all or part of the Le Mans Engine Modification Kit remain a minefield of outright fakes and cars misrepresented to one degree or another. It's a curse to try to value them, and they shouldn't be seen as a distinct variant. Rather, they are best conceived as falling somewhere along a continuum.
There are the 640 factory 100M models and there are the 100 models that were never fitted with the Le Mans Kit, and everything else is somewhere in between; somewhere on that continuum. To value or even define one, you have to discover how much of the Le Mans Kit is installed, how much of it is composed of original components and how much is reproduction/substitute items, who installed it and when, etc. And then you have to decide if it has any effect on value.
If a complete, original Kit was installed 50 years ago at a dealership, is that car any more valuable than one with an equally complete and original Kit installed yesterday at Tommy's British Car Care Center? If you perceive a difference in value, then you are agreeing that notional aspects have value - it's not the physical composition of the car; they are identical - and placing a value on notions such as that is tricky, to put it mildly.
Will the car that had the Kit installed yesterday gain value with time, becoming as valuable 50 years from now as the one that just celebrated its 50th anniversary of the installation of the Kit?
These questions are argumentative and the differences are notional. The term caveat emptor must have been coined for those considering the purchase of a Kit-equipped car.