I agree. Why? The 235 is a really low power powerplant, except for reasonably decent torque. It would probably feel okay, compared to the Iron Duke 4-banger, but probably not worth all the work. For a lot less work, why not get a small V8? The smaller 305's have good torque, not a lot of power, but would feel more than adequate in your S-10, and are a dime a dozen. Besides that, they sell V8 kits for an S-10 very inexpensively.
Either that or maybe upgrade to the tuned port 4.3 liter V6, which probably has the same bellhouse bolt pattern.
