67 Impala 427

[BBIGG BLOCK 396]

I have a friend that has the opportunity too purchase a 67 Impala with the original 427 in it,anyone know how I can find out how many 67 Impalas were built with factory 427,muncie 4 speed and 12 bolt rear.I went to look at the car today,has some rust around the front and rear windows but all floors and trunk in real good shape,checked the stamp on the block after cleaning it and checked the numbers and the engine is original for the car,has the Rare SS hood with a very small amount of rust.My friend would like too know how many of these were produced.

Thanks

Bobby