You're gonna want the starter cable going to one of the large posts, and I don't think it matters which one. You want everything else, including the battery cable, going to the other large post. The red wire with the push-on connector goes to the small post, which is labeled "S".
Did you change to the small-case high-torque gear reduction starter? If so, it needs to be wired differently.
'88 GT convertible, 5 speed, 3:08 gears, A9L Mass Air conversion. Mac shorty headers and H-pipe, Magnaflow catback.