You have an 81 RH. It has the timing plate for a standard fitted (E, F, G or H) it has a centrifical weighted pick up. This timing set up is compatible with the 2H7 TCI box.
If you change the TCI you will need to match it with a 4RO timing plate with a non mechanical advance. If you need to chat PM me your phone number and I can talk you through it.
Eddy