The typical rebuild on a 4bt will run you under $2,000. 00 for a long block. I have had several rebuilt in the last few years for myself and friends. If you can find a tired 4bt for $1000. 00 or so, you're doing well going this route. The biggest advantage you'll have is the accesories will be on the used engine, not as likely on the new ones for any were close to $3,000. 00