I have a friend who has recently built a 68 convertible. I talked to him right after he put the engine in and he said it was an original 283 numbers matching engine. I told him that I didnt think 68 had a 283 but he says they made about 600 of them and he can prove it. As of yet, he says he hasnt found the proof but he is sure he is right. This is an older gentleman around 71 years old, and he may know something that I dont know about this. Is there a possibility he is right? I dont think so, and Im not even going to say anything to him unless I find out he is right about this, then I will tell him. I admire him for still going strong and building a camaro at 71! Im 46 and I just finished an 18 month resto on a 69 that took 20 years off my life!! Has anyone heard of 600 built with a 283? Thanks.