Lincoln Y-Block ECS-B

I just bought a Lincoln Y-Block and 4 speed ****** with 10,000 miles on them .The casting numbers are ECS-B.Can anyone translate what those numbers mean as far as mill sizes goes? Any help will be greatly appreciated.

 

Look up the number for Lincoln Land in Clearwater,Fl. and ask for Eric.....he will tell you everything youve ever wanted to know...and more for sure!

 

Heavy Duty Truck 302, 4 barrel carb. See your PM.