I see the release dates for various tech to be late for several key items. Items such as 3 and 4 speed auto transmissions were being used in the mid 50s on mass productions cars along with 4 barrel carburetors without reliability issues. The ability to use such items early on IMHO should require extra engineering time rather with a less a hit on reliability. I myself drove daily back in 2007-2008 a factory mass production 1956 Pontiac StarChief with the factory 4 speed hydromatic with no reliability issues. It helps to remember the hydromatic brand brought affordable automatics to the masses starting in the 40s. By the 1956 release of the jetaway hydromatic about 1/4 of all automatic equipped cars in the world had a hydromatic. Pontiac and Oldsmobile were offered the first year to have this transmission. Mechanical fuel injection always was unreliable, however I notice that electric (not electronic fuel injection) isn’t available in Automation yet either. Chrysler (Desoto) used electric fuel injection as a option in 1958-1959 IIRC). It worked better then mechanical, but not many manufacturers ventured into electric injection, but it does offer a good alternative to mechanical injection til electronic injection
As a avid post war US auto fan its almost impossible to come close modeling many mass production cars of the time which accounted for a huge chunk of global production at that time. Example being the hugely common 57 Chevy 283 power pack with the 4 barrel or mechanical fuel injection, 4 speed automatic which was installed in several million cars by 1960, the 1955 Chrysler hemi with the dual 4 carbs, etc. Many of the carbs released in the early 50s were used well into the 60s without changes, and the ubber common Rochester 4GC 4 barrel used in multi million cars is more reliable the the quadrajet which ive had to rebuild both on multiple vehicles ive owned.
My point in all of this is when a good percentage of global production had access to this technology why not make it available to a company? Especially when taking into account US manufacturers offered these items to other companies (British, Australian, and french as examples). I think to keep it realistic to access tech before its agreed release date should cost much more research and less a hit on reliability to keep true to historically significant tech. Other items such as mechanical fuel injection always was finicky and unreliable however.