Budget 340 Upgrades

Will building a stroker out of the original block hurt the value? It could always be put back to stock if you wanted to. The car is very cool all original, sunroof convertriple, hood scoop, stripes. It sat outside under a cover and needs paint bumpers rechromed and stuff is a little oxidized. Its a driver I want a car that I can use with out freaking out about it. I'd like to be at about 400hp.