Pretty straightforward, really. The immigration/customs facility is out in one of the "pods" of gates. You'll either reclear TSA at that point or be shuttled back to the main terminal and have to clear the regular security line. I don't remember which they typically use but I'm pretty sure I saw passengers shuttled out recently. At that point just back through security and to the gate.
MCO security lines can be a zoo and that will likely be the deciding factor in whether you're at the gate for the earlier connection or not.