The aluminum wheel Zeeke98 posted are 86-88 Monte Carlo SS wheels and the wheel Syclone2673 posted are 83-85 Monte Carlo SS wheels. They didnt start using the aluminum wheel until 86, they both should be 15x7 with a 3.75" backspacing and 5x4.75 bolt pattern. Both wheels should fit fine on a s10 even with a drop spindle since the G-body and S10 used the same spindles and control arms.
Yeah most people including myself put those wheels on their Monte SS. Have to watch out though when looking at used ones b/c they used the same wheel on late 70's Camaro's but the back spacing is different.