I would disassemble it yourself, sometimes your parts are switch out for another inferior part. If the car is going to be a "KEEPER", I would bore it 30 over, if needed and have the rings set a little tight, for the motor to give you years of good service. I use TRW Forged 30 over on all my two 340's and that has been over 35 years ago. On your discount, a good core 340 should be around $2,000- $2,500 with the 2.02 "J" heads. A 360 2 bbl, "J" head motor should be around $800.00 to $1,000. Check the driver side of the block and make sure it is a true 340 block with all the goodies. The motor mounts are the same, so you can't go by that.