My calipers have an R and an L cast into them I presumed that this was left and right, But If you are running them the other way around with no probs then it must be ok and I will do the same. I think on the hilux the bleeder is at the top but the caliper is mounted toward the back of the car and not the front as in the AE86. Also what did you do in the way of springs.
Also what is an RCA? Its probly obvious but I often miss these things.