Just so you know the GM 2.8l engine isn't that great an engine especially out of an S10. In addition to my tracker I also own a 2.8 V6 Fiero. It sounds awesome and would have plenty of power for a zuk but it's still not the best choice for a swap.
The first problem with the s10 2.8 is it doesn't have the High Output heads of the Fiero.
The second problem with 2.8's in general is the oil passages in the block are too small. This causes high RPM oiling issues and possibly main/rod bearing failure if you're not careful.
2.8l Fiero iron heads, intake, and accessories bolt up to the infinitely better 3.4pr block out of early 90's camaros.
These engines are MUCH heavier than a modern I4 and get somewhat less than stellar gas mileage. I get about 28mpg in an 86 fiero GT with muncie 4spd. Wind resistance in a tracker would probably drop that MPG like a rock.
If I were to do any engine swaps in a zuk I'd be looking for a modern lightweight I4 or V6 to increase power AND mpg. The only way I'd go with old school iron in one of these little rigs would be for a lowered RWD on road monster.