May be worth a punt at $1500 but its still going to need pulling apart .
From my experience the following may be rusty if stored for 6 years with no oil .
Cam - valves - bores - crank
All of which are easily sorted but involves a cost.
Glass half full it may be fine and you may be lucky
Glass half empty its going to need a rebore and a **** load of machining and all the new parts fitted as per receipts are scrap.
But i would have a go at it for that money and keep my fingers crossed