They'll ask for some under the table money in this case... but it's doable, as the process will be done at a back date. Change of ownership and engine change number both can be done in a few hours. I believe you'll have to take the vehicle with you as the inspector will want to check the engine number physically. I suggest you hire an agent at the office there, they know all the tricks and for around Rs. 600/- will save you a lot of useless running around.