When you're conducting a restoration or building a restomod/modified, what should you choose - new-old-stock or reproduction parts? Choice depends on the nature of your project and the quality/fit of reproduction parts.
If you're doing a concours restoration where originality is very important, new-old-stock parts, where available, are the most logical choice. If you're doing a concours, street-driven restoration, it makes more economic sense to go reproduction parts. Again - when reproduction part quality and/or fit are poor, new-old-stock or good used (restorable) makes the most sense.