You might have some other options...

I have a 'metric' frame from a '78 Monte Carlo, and in discussing some of the options with it, I've been told that this frame, even though it uses coils instead of torsion bars, uses many of the same front suspension parts as your S-10.

There are custom air arms built for the metric frame for use in racing.

Another possiblity to chase is looking at the brake rotors to see if you could swap on some that are thicker, and thus increase track width some.

I haven't checked this, but one race car guy you could swap rotors off a metric frame to a Camaro subframe to decrease the track width. If the reverse is true you might be able to swap Camaro stuff in place to widen yours...

I haven't tried any of this, its just stuff others have said as I've investigated putting the Monte Carlo frame under a '54 Chevy pickup.