1968 dart gt mini tub?

I'm looking for opinions!! Just got this really nice 1968 gt dart. This car has had all the side moldings removed and a 440 installed. It was being built to be a show car and is highly detailed. My question is do you think if it was mini tubbed would it increase or decrease the value? Figured since the moldings were removed and original engine has been changed why not do it. Only asking because I got the dyno sheet with this car and with stock size tires the horsepower is just going to waste.This is my first mopar and not really sure how sought after these cars are. Thanks.

Tubbing won't make a bit of difference, in value, on an already non-stock GT.