I'm putting in a engine with holleys 502-6 TBI 670cfm replacement throtle body. A local machine shop said they can do a turn key job, valve job, bored out, basically a new long block with my intake, ignition, and tbi for $2100.00. A new longblock ordered is 1925.00. My question is finally, would there be a significant difference in the two. The shop has a good reputation and they say it will be like new. I need some advice if anybody has had a rebuilt or new engine. Thanks!!!!!!!!!!!