69 Chevevelle question, help please

[macs69]

Hello! I have a 1969 Chevelle that I recently purchased. Ran the cowl tag, and the car is a 61 upper/lower paint car, which is burnished brown. It's now painted red, with a black interior. The original interior was parchment, with a bench seat. Original big block, four speed car. I bought it with a 454/425 crate motor in it. The car had been raced quite a bit, and the guy I bought it from stated that it had a 427 in it before the 454 (he had bought it from the prior owner with the 454 already installed, and had only owned it for about 8 months). The car has a SS hood and badging, but that was probably done when it was painted red. Can't tell if it had a tach or not, has a Autometer tach in place of the original. It now has a turbo 400, and the original 4 speed is gone.
The statement about the 427, and the fact that the car has a "KQ" coded rear makes me suspicious. Is there any way to verify if it is a COPO Chevelle by providing vin number or cowl tag info on here? I searched for the build sheet under the back seat, but no luck.