Best to speak with a local import broker about this question. Find out all your costs ahead of time. As stated elsewhere in these posts, EPA compliance is of concern but not necessarily the road-block that you might think. Fill out all the paperwork ahead of time and be sure to get a good agent/broker with experience in India imports and EPA requirements.
You will of course have much higher incremental costs with a single engine than with a full shipment.
Good luck with your venture.
Gary
diesel-electric.us