Hello, I am wondering about which way to go with my latest project, but am not really sure that what I had in mind is the right thing to do. Please help. My car is a 1970 Challenger Convertible, don't get too excited it is plain jane, no power anything, slant six-auto, no air. I was thinking about a mid size v-8, auto, adding the power goodies and air cond. The car does have a power white top w/white interior, and was originally Purple. I don't want to destroy the cars value with the upgrades, but it's pretty boring as-is. I guess I'm wondering if it will be less valuable as original or upgraded. Thanks