Mike
I have the LAT 1 set up on my 260. Unfortunately, I do not know exactly when it was installed during the car's history, or if the manifold and carb were installed as separate components, as opposed to the original LAT 1 package. I have the warranty tag which indicates a date of 057 '02, which leads me to believe that the carb, although the correct type, is a much later version. Consequently, this might not be exactly what you need.
I can say with certainty that the carb is it a Holley 4-barrel, Model 4160, 465cfm, Part # O-1848-1.
Hope this helps.
I have the same kind of question and am trying to determine what is on the F-4 b . the only visible numbers are the many patent numbers and some very small ones on the fan side of the float bowl. I scoured the air horn and do not see a number. Naturally I'd like to think that it is the OG motor with a LAT period correct thing going on. It has an Autolite dual point cent. advance and had a short stock coil, PO put a new auto part store generic which wiggles around in the mount on the manifold. I will get some pics today but have not posted ant to CAT yet. Thanks W. in So Cal.