4 speed conversion. Help or hurt value of car?

Thanks for all the opinions. They are all greatly appreciated. I do already have the parts to do the conversion. I am more of an originality guy, but when I look at any vehicle the first thing I do is look for a third pedal also. But then on the other hand maybe I will not want to drive it as much when I am older and my body has some wear on it. The only reason I purchased the car is because I wanted to save it from its current state and owner, and it was local. I was looking for a 4 speed. I will have to think on it some more. Currently the car is in a million pieces, the way I purchased it this summer. So I have some time to ponder it.