maniflow valve coil spring question & changing tranny & vacuum lines to copper

First question I have is about the manifold coil spring that turns the valve. Should I find a replacement coil or cut the valve out. I just had the motor professionally rebuilt, ( just lol 3 years ago) but anyway, I was told by an old time mechanic to just remove it.

2nd question, being a plumber, I love copper piping, so I'm thinking of changing all the tranny lines and vacuum lines to copper if I can find the right diameter. Has anyone tried this, do you think it will work on the tranny lines ?

Thanks for the help, Vin