The release is a little round lever, right in the front. Then there's the usual secondary release. I'll go get some pics in a bit, it's actually not raining today so it's easy to get to.
64 Valiant has the round lever under the front lip of the hood. 64 and 65 Barracuda have a paddle type lever that goes through a hole in the front edge of the hood, as does the 65 Valiant.