I am possibly going to be selling my 11 5.0 in a week or two(depending on a few things), and have been looking at some 03-04 cobras. Long story short I have found a turbo/auto car, but the owner says it will not start because it needs a new key because the transponder is dead, and needs to go back to dealer to reset the anti-theft and get new key. He claims that he was out driving one day and it made a funny beeping sound and it would not start after that. He also claims that the car has an mmr 900 short block, but no receipts because it was done by previous owner. Any way to tell on the motor? Or should I just stay away from this car? Thanks in advance for any info on things I should look for on these cars.