Of the Mk37 director, the website Military History says: "While the defects were not prohibitive and the Mark 33 remained in production until fairly late in World War II, the Bureau started the development of an improved director in 1936, only 2 years after the first installation of a Mark 33. The objective of weight reduction was not met, since the resulting director system actually weighed about 8000 pounds more than the equipment it was slated to replace, but the Gun Director Mark 37 that emerged from the program possessed virtues that more than compensated for its extra weight. Though the gun orders it provided were the same as those of the Mark 33, it supplied them with greater reliability and gave generally improved performance with 5-inch gun batteries, whether they were used for surface or antiaircraft use. Moreover, the stable element and computer, instead of being contained in the director housing were installed below deck where they were less vulnerable to attack and less of a jeopardy to a ship's stability. The design provided for the ultimate addition of radar, which later permitted blind firing with the director. In fact, the Mark 37 system was almost continually improved. By the end of 1945 the equipment had run through 92 modifications—almost twice the total number of directors of that type which were in the fleet on December 7, 1941. Procurement ultimately totalled 841 units, representing an investment of well over $148,000,000. Destroyers, cruisers, battleships, carriers, and many auxiliaries used the directors, with individual installations varying from one aboard destroyers to four on each battleship." 

As for the Mk8 Fire Control Radar, the website The Pacific War Online Encyclopedia says:   "The Mark 8 (FH) fire control radar was used to direct large-caliber cruiser and battleship guns. Its design dated to 1941, but the previous FC and FD radars were good enough that deployment of FH to the fleet took place at a relatively leisurely pace. It was the first operational radar to make use of the phase array principle, using mechanical switching to alter the phase relationships between different elements to steer the beem without physically moving the antenna. Though it gave no useful altitude information, it had remarkable accuracy in both range and bearing, making it ideal for fire control against surface targets. Its rapid scan of a 30 degree arc simplified acquisition of targets.  One drawback of the Mark 8 was the complexity of its antenna array, which prompted development of the postwar Mark 13 parabolic antenna."

You can also find a scan of "Ordinance Pamphlet No. 658" on the Researcher at Large website.  This pamphlet goes into great detail on the Fire Control Radar, Mark 8. 
The packaging is in the usual large plastic clamshell container, with double sided tape securing the print rafts to the package. 

There are three print rafts included.  One contains three Mark 8 FC radars.  The other two print rafts each contain one Mk37/Mk4 combination. 

 
• CL-57 Montpelier
• CL-58 Denver
• CL-60 Sante Fe
• CL-63 Mobile

My only complaint about this set is the faint print lines.  Hopefully those will disappear under a coat of primer or paint. Otherwise, recommended. 

This is Kraken Hobbies 1/350 USS Birmingham CL-62 1943/1944 Director Set.  It retails for $16.99 USD, and is available directly from Kraken Hobbies, who I'd like to thank for this review sample.