I sold last year the twin to this car {Royal plum/plum interior except mine was just a 283 car and I have a Plum SS 427 car now. Im really into these plum cars. Plum interior was only offered in the caprice line and is very rare. That looks like a cool car. I got 10k for mine so we know this car is north of that at least. go for it. I know that id love to have it next to my 427 car!
The only thing that looks wrong is the air cleaner.