I am no expert, but I don't think the 1.08 was introduced until the appearance of the 260/289. The 1.08 is rated at 480 CFM.
Most early 4100's were 1.12 (early and big engines)(I believe). The 1.19 was a unique carburetor and only used on the 1958 MERC 383 HI-TORQUE.
You can usually tell an early AUTOLITE from a later by the size of the accelerator pump housing (longer). There was also a style (1957) that used a somewhat divorced choke housing. It is hard to say what you have without the ID NOS.
But the fact remains, the 4100 is one of the best carburetor designs ever...
