Thanks for the help , i'm going to order a couple of the DS3231 and see how it works ,
As far as the progress of my project , i already have one display modified and running with the 74HC595 instead of the 74LS248 , it wasn't so bad , i used the same Dip socket and did some wiring on the back for the segments and power .
i'm running the clock now with a NANO Mini and a DS1307 with one display , i'm waiting on some more of the 74hc595 to come in the mail because it turned out that only have 2 IC's in DIP package and a bunch in SMD and i didn't want to miss up the pcb so i'm going to wait for the others.
As far as the code, i found a code to do exactly what i need , i'm just going to do some preference modification to it , like the timing for the Temperature display , how long to be on and how many seconds to be on (i think the original was 3 seconds).
also i want to change the format form 24H to 12H and figure out how to blank the 10's Hour digit when its 9H or less.
It shouldn't be bad just some light tweaking.
i will post the whole project with code and documents after i get it done for any one likes to construct the Jumbo Clock.