Current information indicates the Fall 1965 build of the B19KC engine was mid October 1965.
Shipping from the Cleveland Foundry could be up to 2 weeks or more; then moved from the entry dock in England to Jensen would take more time; then there is unloading, unpacking, some assembly maybe required and then placed in the Q to go to install assembly, all time consuming and variable. So NO I do not know the time frame for engines from USA to install.
My best guess right now on very limited information is 4 months; the time frame for my Tiger ‘s engine was 6 months so the time frame is also variable.
More information is needed for all Engine Groups to answer this type of questions.
Original Tiger Engine Study