Need opinions on this Demon for $25k

Hard pass,$18k tops, numerous red flags. Typical flipper stuff, doors don't line up, uneven gaps in both doors and back bumper.
Painted over rust, can't fix a vacuum leak to repair the brakes for $25k?.
That bubbling probably means rust holes all of the way through the quarter panels and door skins have been filled/covered with filler and painted over.
If you look close at that rear Quarter post #1 picture #3, I can see a 6-8 inch hole that's been filled. Follow the bubbles down to the filler line across the bottom (which is extremely visible) then to a small bubble, up and to the left, ignore the orange peel and look how the middle of the hole is flatter, less contoured and smoother than the rest. The contour isn't right on that quarter panel at all, it's too flat.
Whoever did it is pretty good but raises serious red flags because most who can do that good of a coverup wouldn't. We all know there is only one way to repair rust...

The mechanical bond between the filler and substrate has broken down in those places because either rust wasn't removed or contaminated prep work. It'll be cracking and/or peeling within a year or two.
The quarter most probably needs cut out, new welded, re painted.
I'd definitely be checking the block to actually be a 340.