Does putting a tilt front end on a 1969 corvette hurt the value?
If you have an all original numbers matching car with desirable options then straying from original would hurt the value.
Yes it would.
I will add that anything at all that is not 100% original will hurt the value. A few things are OK to upgrade as long as you keep the original parts to put back on the car. Anything that permanently alters the car is a big no no.