The 240 is the unadulterated design, mess with it ( sorry,...mod it) and you are moving away from the "spirit" of the original thinking. For better or worse, the production 260 has already moved away and the 2+2 is really a totally different concept altogether - a b*stard son of a b*stard father if you like
You can only improve the looks of the +2 by modding it, whereas you just detract from the purity of 240 design with mods, even if you may actually improve the driving experience.
And before any +2 owners get offended....I think a metallic grey, black-chromed, g-nosed, big wheeled, fender-mirrored +2 looks awesome!