Black with gold covers and air cleaner. There are some pictures of a really nice correct car here:
https://www.jalopyjournal.com/forum/threads/1964-ford-galaxie-500-xl-price-drop.981665/
Nice car! Yes the block-heads-intake-oilpan-frontcover-waterpump was black 1959-1965. Probably the exhaust manifolds too but that burned off right away.
IIRC all FoMoCo engines had black iron 1959-1965
Exceptions: The 144cid was all blue, and the 292cid truck was red iron.
Valve color / air cleaner colors varied by year, engine, and model.
The gold on the car for sale LOOKS a little dark but could just be the pictures. IIRC the 63-64 Ford 390/300 was castillion gold, about 1/3 silver, 2/3 gold.
On the other hand, the 390/375 hipo and 406 and 289-4bbl Mustangs were a darker gold, more like the shade in the link, at least as it comes out on my laptop. I've sprayed plenty of them with just "VHT Gold" even though its not exactly the right shade.