340 engine

Bucky Jones said
I do not totally ungerstand what numbers matching means. I am looking at a 68, 318 fastback with a 67 front end and grill with a 340 automatic installed. I am really concerned about the pedigree of the car. The title matches the VIN on the dash (questional originality) as a 68 but the number on the radiator core support is different. I'm told that there is another VIN in the trunk...??? Please help!!
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Numbers matching just means all of the components that have a VIN on them have the same VIN on them. Those parts are the VIN tag, radiator support, trunk drip rail, cowl on some cars, engine and tranny. Mopars didn't start doing the engine and tranny until 1968.