According to honda's published parts and labor prices, a short block engine assembly sells for $2702.45. YOu will also need some gaskets, fluids, etc; on most vehicles this adds around $300 to the engine cost.
The flat rate labor time to replace the short block engine is 17.3 hours. Labor rates vary between diffetrent shops and different parts of the country, but national median is around $75/hr; for a labor cost of about $1300.00
This gives a general ballpark total cost for the job of around $4300.00