Ford 5.0 block casting # 23 E6SE BA S what does this mean?

Ford 5.0 block casting # 23 E6SE BA S what does this mean?

Look see what Google can do for you.
http://www.classicmustang.com/decoding_part_numbers.htm

E=Decade (1980)
6=Decade Year (1986)
S=Car Line (Thunderbird)
E=Engineering Group (Engine)
BA=Suffix A-1st revision B-2nd revision, etc.Ford was on a learning curve in the 70, s for emissions so it was not uncommon to see AA, AB, BB, BA, etc for revision numbers.You've got a 302 block out of a 1986 Ford Thunderbird.