Ford cast iron shortys. They were used on the 352HP, 390HP and 406 from 1960-1963.5. Also known as you said to be used on some of the Police cruisers in the day. When the 427 was released the longer cast iron replaced them. They were the first Hipo ex manifolds made for the FE. Most when stock used a flapper valve on the pass side with the choke tube. Mine sold for $650 4 years ago from the 406. As Mike said they hover in the $500-600+ range for a solid set. Cracked and repaired sets $300 and up. I've seen NOS sets sell for $800+. Welcome to the forum.

G.