I too have recently been wrestling with this question.
In 1963, when I got my first car, a 1928 Chevrolet Sport Coupe, it had factory 'Chevrolet' step plates on it. Later on, when I got my '32 Pontiac Dlx. Sport Coupe, it too had factory (dealer ?) installed "Pontiac" step plates.
In 1964, when I got my 1928 Ford Phaeton, it too had a step plate (only one) on the Driver's entrance.
This was all LONG before there were any 'Parts Houses', and before there were any reproduction parts being made - such as the now ubiquitious "Ford" enblemed Step Plate (which never existed prior to 'repro.' manufacturing, about 1970 or so).
In those days (late '50's and 1960's) I really liked all the various and assorted accessories that the cars, including Ford, had on them - all a 'statement' that reflected both the car's owner, and the car's use. And I added several myself - any thing that was made and available in the 1920's and '30's.
One of the things I began collecting were original (1920-'34) Step Plates, both unique ones, and as complete sets. I still have that collection. It is from this collection of vintage 1920's step plates that I and wrestling with - do I insall or not .
One of the problems with having a low-milage car that was restored for fine point blue ribbon MAFCA/MARC judging, is that I had to stip off all of my original accessories. Now that forty years have passed since it was a "Show Car", and I have in those forty years, gotten used to the car without ANY accessories, including the car's original (1928) step plate - I lack the courage to "drill" a hole into a pristine running board.
But I want, and would like to have once again, my original 1928 Step plates back on the car. For me the question would be easily answered - YES ! - . . . . IF I did not have to drill holes in the running board. You can only be a 'virgin' once.
If I had reproduction running boards, I would not hesitate. I would put them on (as I have done on my late '31 Dlx Coupe).
- Doug Vieyra, Eureka, Calif - RAIN today - finally !