Hello I'm new here and have a few questions.I own an 84 RX7 (12A motor, my username is misleading) anyways I would like to know what parts I need to intstall a 13B and also a 13BT.I knoe I need the engine,trans, harness, and ecu.Is there anything else I need and how much would it cost me to swap in those engine's?I would prefer to have it done buy a shop mostly beacuse I don't want to mess up the harness.