Yes just about everything to do on a diesel engine is usually more expensive than that of a regular car engine. This is due to the higher price of diesel engine parts and labor cost to repair.

Capo truck sales is the largest supplier in Long Island that could meet your needs for a used diesel engine. However, they won't be available instantly off the shelf. You'll have to speak with a representative first, who can help you with the purchase and acquisition.

If the only thing wrong with the engine is the cylinder heads, yes you should replace just them, Getting a rebuilt motor is expensive and not needed unless the motor has been damaged beyond repair.