"Has been painted once" kind of clouds things, as per a true survivor, but if no rust, etc, I would leave it alone and enjoy. I have owned a couple of L-78s with low miles, a '69 Camaro and a '69 Chevelle, both survivors, and both ran great, rode and drove excellent, just fun cars. The Camaro would SCREAM, maybe out running our Yenko Camaro, and the Chevelle simply hooked and went, with no hint of the dreaded wheel hop. As Rob and I get more and more involved in Pure Stock drag racing, we realize we should have kept both of these cars.
Nothing against restored cars, as that is what my cars are, just really appreciate survivors. Partly I think 'cause there are so few of them left.