That is a solid looking car for $3500 no doubt.I'd liken the Galaxie more to a C-body of the era. They (C-bodies) can be had reasonably on occasion,especially with a 383,ebut $3500 is still a steal for a car that solid no matter the make. The 4.25 bore X 4.25 stroke motor could be built on a 383 or 426 wedge block as a parallel to this
Who makes the aluminum Ford heads Andy?

Auto. It is a 390 HP car but someone swapped a 427 into it back in the day which is why it has 427 emblems. It now has a 390 in it complete with cast iron headers.

For you mid-west guys this car does not appear to have any major rust. The car was stored outside for a while and the carpet got wet so there are some areas with heavy surface rust but no holes in the floor or the trunk area. Paint seems to be original most everywhere. Trim seems to be complete and undamaged. My buddy paid $3500 for the car which seems like a steal to me but he also had a 390 Torino that he tried to sell for a long time and nothing but tire kickers. So maybe the Ford stuff just doesn't sell like the Mopar stuff. I think an early B body car with a big block engine in this type of shape would be a lot more than $3500.