I am installing a rebuilt 235 in my '46 6400. It has the following sequence adjacent to the distributor: FII4B
and there is also this: con 3 A 139
It is the 3764476 block which could have been made in several years so really only for my own education can someone tell me what any of the rest means. I know the F is Flint but I am not finding some of the codes defined.

Thank you in advance for your help. LevisPop

Milk the cows you have