are things really that overpriced these days?

It would be overpriced for this area: So Cal

But I know stuff in Canada goes for a lot more. Especially if it really is rust free.

Really there isn't enough good pictures and info to tell how overpriced it is. It may be an original 340 4spd 1970 Swinger with a 440 transplanted in it. It actually sounds like it. You will have to ask for the vin and fender tag info (no tag in photo). That will change things.

But there are clues in the picture that car wasn't that nice to start with.

Like the door panels and door handles are off a 1967 Dart. Does a 58K mile car that's always been garaged need door panels? Shows the effort and care put toward the rest of the car.

Car has been fully repainted in engine compartment and jambs. Hood latches painted over, missing all the window washer equiptment, 71 center caps in rear with 70 in front...

Enough info from the pictures to show it really needs to be gone over with a fine tooth comb before purchase. As with ANY car.