I say go for it! Numbers matching is the most over used term in the industry. Say it had the original LS5 in it, but the cam, pistons, intake, etc was all changed. Would you be willing to put down another $10-15k for that? My car didn't come with the flapper either, but it's the original hood and it's an SS454.
Of course you'll need to take a closer look, drive it (or get a solid ride in it). Check for leaks or anything you will need to repair. Make sure it's not just a giant bondo job.
If it's as good as it appears, that car would sell up here for that price easily.
I agree... take a good look...
it is as good as it looks (big IF); nice paint, I am assuming no rust/rot or questionable repair jobs on the body, decent frame and runs and drives well, then $25k doesn't sound bad at all... Does it have a 12-bolt rearend?
Without paperwork to document it, it could just be a clone/tribute based on a Malibu anyway... But even so, it has the "SS" round pod dash, has the correct SS hood (as noted above, that is the standard SS hood, the "Cowl Induction" with the flapper was an extra cost option).
The hood stripes don't look correct to me (but I am not an expert).
But IMO, a nice, solid, running/driving, big block, bucket seat with SS gauges, etc for $25k asking, sounds reasonable...
As mentioned, the asking price is a starting place, and you can and should reduce your offers based on any issues you find...