Unfortunately, crooks are in our hobby. This reminds me of a well known Mopar shop in the San Fernando Valley (L.A.), that was raided a number of years ago for VIN tampering. The alleged indictment were from complaints he would turn 6 cylinder/340/383 cars into 426 Hemi's by altering the VIN, and selling them as such. I do not know if the owner was convicted or not. Bottom line, IF it seems too good to be true, its usually not. Buyer beware!
