help me date code these 727's

I'm looking for a trans that will work for the 67 GTS 383 Dart I'm building. I need to find out the date codes for these two BB 727's
First
part number is 2466900
numbers on the rail are H22538334 2862390
And is marked a 66

Second one
part munber is 2466900
number on the pan rail is G2538334 228385
And is mark 6? (can't read it)

And finally I have a SB 727 I think out of a 68 340 GTS Dart i need to verify
Part number is 2801260
number on the pan rail is K2892032J 2231 116
And is marked 67


Thanks for your time in helping me out.