Subframe Connectors, just do it!

I have a set on my spare parts car , bolted on , not welded . Do you think it would take away the value of the car down the road if I ever decide to sell ? The car is 99.9 % stock , except for headers . I would like to put them on (better handling , less body flex ) , but
don't want to hurt the value of the car . Original 1970 swinger 340 .
All the stories of how much better the car feels is tempting , especially since I have set sitting in the garage .
Decisions !!