69 Dodge Dart in Illinois on eBay right now very cheap has aluminum slant 6 in it from 64 Valiant

Well, two things. It's not an "all aluminum" slant 6. It seems to be an aluminum block slant 6. Also, it's not a 1964 engine I don't believe, as they were not made that late. I believe it would be a 1962. @slantsixdan can tell us for sure which year(s) they were made. Dan, help us out here!