It appears to be a good quality restoration. The boiler looks repainted - it is very dark - cab is definitely re stamped and the font is wrong. Handrails look replaced and the stanchions are replacement turnings. Rods or rod screws are all replaced. Drawbar pin chain is incorrect and replaced. This locomotive has been thoroughly gone through at the least. Word are wind as far as provenance..unless you have it in writing.
As to value, prewar Hudsons tend to maintain values... but are heavily condition dependent. Parts locos go for $600-$800. A full set of scale wheels is $500-$600. A prewar 700E steam chest goes for $500. Common varies that are mostly original and have un-warped shells typically sell for $800 to $2000 (763E/2263W Gunmetal, 763E/2226W Black) Uncommon varieties - or common but desirable - typically sell for $1600 to $4500 (763E/2226W Gunmetal, 700E/ 700T Black) and really nice, fully equipped, boxed of these are $3200-$8000. The truly rare (700K still boxed and unpainted with all the paper)... well lets just say most people have never seen one much less can afford one.
The boiler shell is straight on this one... from your pictures anyway . You should enjoy running this locomotive . If you can add tender photos, close-up cab window shots, and a straight from the front shot to your photos, that would be good.
I would say that you got an ok value. Good thing you negotiated the price down! You should be able to get your money back if you sell it.