Sparky, 1" gears means it is a CS-1. a CS-2 uses 3/4" gears so the cases are shorter, and the CS-3 uses 1/2" gears and is the smallest with the least drag and horsepower loss.
My CS-3 5 speed is one inch longer than my CS-1 4 speed, just enough that I have to chop my driveshaft for the fourth time (T-10, Owens 3 speed, Lenco 4 speed, and now the 5 speed). Just to add insult to injury, the driveshaft shop won't balance it without new u-joints that they furnish.........................
Bob