advise needed

im thinking of selling my zed in few months its a j spec tt auto 1990 but have know idea on price, have spent thousands on mods & i know ill never get all the money back, zed is immaculate full t+t had replacement engine approx 4yr ago with a low mileage engine from api cost £1700 plus new stock tubs since then have only driven zed at weekends & spent more time on mods so mileage is very low full spec is in rides section with few pics have done alot more since then so my question is what sort of price could i expect zed is in my sig but its in met grey not purple