Love those old square body S10s.  Back in the day I had an 87 in UPS brown; not exactly a looker but solid as a rock when I needed it.

That doesn't sound too extreme (though it looks to be a pretty uncommon tire size). If that is correct, it calculates to about 27 inches, which should be OK in an S10 (but don't trash the old ones until you see if the new ones rub). 

It will be a little more unsprung weight.  I would guess it will be slower off the line, get worse mileage, be smoother over small bumps and rougher over big ones.  You will also need to recalculate your speedo (or do the conversion in your head).

I generally wouldn't recommend messing with the geometry on an old car or truck.  But I doubt you'll have too many problems.  The 93 came with either the "Iron Duke" 4 cylinder (which you'll never kill) or the 4.3L V6, which will handle bigger tires just fine.  And I'm guessing you have either the Borg Warner T5 manual or the 4L60 automatic, either of which should also be fine (but verify what transmission you have first).

Lots of S10 questions today.

First off, your speedo will be incorrect, will actually be faster than what is indicated on the dash. Next the 235's are taller and wider than your stock ones, so you may have clearance issues with tires rubbing on suspension and/or steering components. 

That's a full inch bigger. I would be surprised if it fit without any rubbing.

Wider too so it's going to sling more mud and debris at the body.

I Have a 1993 Chevrolet S10 which I Recently Put 235 65R15 Tires On the Truck. The Truck had 215 65R15 Which Are Smaller, The Bigger Tires Do Good Other than if you Turn the Wheel As Far Either Way As Possible it Has a Rub. Ive Only Had it Rub Once So Im Curious If This Will  Hurt Anything. 

Well I did warn you. It's going to wear down the shoulders of the tires quicker, and whatever it's rubbing against.  You will also have worse braking and accleration.

And if you hit a bump while turning, you might even rip something off.