Hey all, I recently aquired a 1968 firebird that was used on drag strip from the early 70's into the 90's. the guy i bought it from got it from the original racer roughly 13 years agoand it has sat in a barn ever since. it is a 400 factory body but he told me the engine was a 440, not the original for the car. i need help figuring out what the engine really is and when it was made. the numbers on the front of the block are 205763YC. can anyone help me?