1985 as stated saw elimination of the weak 110 HP carbureted 229 V6, replaced with the stronger TBI 4.3 V6 and the 305 got higher compression, a knock sensor and 15 more horses up to 165. All models also received firmer springs, revised dashed and digital radios so it's not like GM wasn't giving these cars any updates. These were some of the best liked cars in my neck of the woods and many families owned variations on this theme one time or another. I always loved my friends 1986 tan coupe with 305, 200R4 and optional 2.73 rear gears. That car felt pretty quick at the time and it was 100% relaible and went well over 200k with the original drivetrain.