Need more details. Condition of engine, how much you will do yourself, are you on a tight budget or do you want all genuine parts, you talking about a full standard rebuild or just an engine refresh.
prices can rocket very quickly depending on what is found during the strip down, so best thing to do is price for worst case scenario. price up machining costs for guides/bores/crank/skimming/decking ext.
ball park probably around 2k-3k as dave said for someone else to do it all and find no issues.