What I have is a 69 rs/ss which is a factory big block car. It was built the second week of Feb. of 69. The person I got the car from...pulled a 427 out of it with a build date of Jan. 30 of 69. The car originally is a 375hp 396 from the factory. Is it possible that the 427 was a dealer install...such as Baldwin-Motions or any of those???? I ran the numbers on the 427 and came up with it being for a 69 corvette. The dates are just so close, kinda wanted to know whats what with it. I now have the 427. Can anyone help me please!?!