I sold my complete rebuilt A14 with HD Daikin Cluthc lightened flywheel and with 60 series 4 speed box for 650 aud but spent more than double that building and sourcing box but needed cash at the time for A15 deal I wanted.

I believe its worth what you think its worth as in the end its a rebuilt engine and go to those horrible rebuild engine specialists and they charge 1600-2000 for most engines, however in reality we are datsun folk so we expect a bargain so its a tough call to make. Good luck with the sale!