If I was doing an UNTOLD TALES issue or series today, I'd have to think about it -- I don't have any stories prepared, because I don't think it's likely ever to happen. And frankly, if Marvel wanted me to write Spider-Man, and managed to talk me into doing it (which I think would not be easy, because Spider-Man has a lot of books and I don't like being one of a gang of writers on a character), I would rather do something set in the present day, where I could take Spider-Man in new directions rather than have to keep fitting stories in-between other stories that already existed.
The best part of writing UNTOLD TALES was that I got to use all the classic 60s characters; the worst part was that I couldn't have them grow or change any, because they had to be in the place they were the next time they appeared. So it was fun, but also a bit confining.
I did want to get to tell the story of what Spider-Man was doing the day Galactus showed up. But I won't tell you that story here, because who knows, maybe I'll get to do it someday.
I don't think a series set in the past would be a strong seller now, any more than it was then. But if it happened before all the retcons, that's a bonus, really.Or would it be kind of pointless to do such a series in todays comic book climate with all the mentioned recons and such that seem to be in every couple of issues now a days.
kdb