I'll give you my opion, though I'm sure you won't like it. To me it's a far more practical solution. Others here will surely give you different advice. Then you can pick and choose.

I'm going to assume you've used terminology correctly, and therefore you have the complete Chevellle frame under there, rather than just a bad front clip job. Based on that, unless the body is of particularly high value (as in absolutely pristine, requiring no work at all to be cherry) I recommend you dump the car. Sell it as is to some other dreamer, or person with considerable skill, time, and money to rescue it from a near totally ruined condition. You've already learned the results of one poor frame swap, a lesson all too often learned the hard way. While an S10 swap may look better to some, it's still no piece of cake, and the results could end up just as bad, albeit different.

You'll be dollars, time, and enjoyment further ahead by starting with a better project. One that hasn't been butchered by someone else. While it may seem romantic, or macho, to "save" an abused project, it's a major, and often costly, PIA. The other alternative would be if you could find a very good stock chassis for next to nothing and start over that way. Otherwise, these cars aren't that uncommon that you couldn't buy a different one that's a better candidate for a relatively modest cost.