@gary1 have you ever seen a astro van at the drag strip hanging the front wheels in the air. They are very common. If your astro van is not stable at 100 mph i would think there is something wrong with it. Maybe it need some attention.
Links were to show potentional when it was suggested the motor is not worth upgrading. The v8 does not work well in the s10 its a little heavy if it has cast heads. So the perferred upgrade is the v6. I see them at the drag strip with cheap turbo kits all the time.
Simple cam and efi reprogram will give a nice boost in performance add in an intake and headers should be able to push that brick hard agaist its top end limit.
I also am not going to tell another grown man how to drive. I can only assume the op has a proper place to test and tune his vehicle i do and so do most people that need to on a regular bases. I leave that up to his own good judgement.