If it has a manual choke he might be running a Webber carb on it instead of the stock Hitachi. That is usually a good thing, more power and all of that.
For a Daily Driver/Hunting rig you might want to also take a look at a Geo Tracker, while they look quite a bit different they are solid little off-road vehicles and have better road manners along with more power and about the same mileage. But I understand the allure of an SJ.
Make sure that it is not an SJ-410. They also had manual choke but only have a 4 speed and, while I love mine, are not the greatest DD vehicles.