The minute you start modifying a 190E 16 valve is the minute you start reducing the car's value & start excluding 99% of buyers who are looking for a good example & willing to pay strong money for one of these.
I much prefer the 16" 15 holes from the 129 on the cosworths these days...
So many of the common worn looking/faded pieces look like they have been replaced or repainted.
I have thus far resisited the temptation to replace the original 15" 15 holes on my 2.5-16, and must say the car drives and feels all the better for it....