There have been multiple threads over the last few years; with pictures.
Others can cover the multiple "1965" versions. Decades ago I had the idea of buying one of every 4V COBRA aluminum intake. That idea crashed when 1964-67 I learned that there were a bunch of them. In 1965 at least two different foundries were doing casting and at least two different shops doing machining.
Cobra wise, there was a light weight thin wall small passages casting made available for Cobras circa late third quarter 1964. It was intended for racing and had no provision of any kind for a PCV system, which street Cobras were built with HP289 PCV systems 4V and 2-4V induction 1963-65. They are very rare. I have seen five ever and three had cracked somewhere or another and been repaired. I have a new old stock one that a Cobra owner ordered post delivery but never got installed. One was dealer installed on a late CSX24xx chassis and its still installed right where the service department installed it. Somebody, the dealer or an owner rigged up a road draft crankcase ventilation system.
1964 Intake (These pictures have been posted on multiple sites since 2011.)
1964 COBRA High Rise 4V Intake Overhead
1964 COBRA High Rise 4V Intake Underside
1964 COBRA High Rise 4V Intake Front Overhead
1964 COBRA High Rise 4V Intake Rear Overhead
The high rise intake was preceded by a regular production option low profile COBRA aluminum intake given a 1964 engineering number of C4SA-9421-1 and used as a factory and over the counter option for Cobras with 1962 HP260, 1963½ HP289 and 1964 HP289 engines. Design wise think 1961 technology flow wise for a 260 cid engine and mild camshaft. They were used Cobra wise with road draft tube connected at rear for HP260s and PCV system connection at rear for 1963½ HP289s. There was a stamped steel cover to block off the vent port in the rear for 1964 engines (same as the plate for over the counter 3-2V systems). This intake is a rebranded Holman-Moody Falcon Rally car program circa 1962. For a brief period the same intake was a option for Sunbeam Tigers with "TIGER" lettering instead of "COBRA". The COBRA version has both the Holman-Moody and Shelby numbers cast in. The TIGER version has only the Cobra number included.
Three Cobras received high rise intakes and R-3259 family carburetors during 1965 after 1965 MUSTANG GT350 production was underway. We don't know what intake manifolds they received as all three cars lost their day one induction systems over time and no pictures have turned up so far. I use to have the carburetor from one of the cars and it was made in December 1964.