Questions on Resubmitting Old Stories

I’m preparing an older story I have already published here for another project. In doing so I found a lot of places to improve it. It’s certainly not a completely new story but it’s much better in style and clarity.

If I wanted the new version on the site, would I delete the old story and publish the new as opposed to simply editing the older version?

Hiya, if it's just tidying up grammar etc, then just edit and resubmit. If you're rewriting parts and adding stuff and it will be quite different from the original, then feel free to submit as new and just remove the old one.