you will need to use a program to inject the save game http://www.xpgamesaves.com/files/download/530-xpgaio/
firstly you will need to put you're xbox live profile unto a usb, then move you're profile to the desktop, run 360 rev, click on package manager Spoiler this should pop up Spoiler click on open look for you're profile on you're desktop open it, then you will have you're i'ds on the bottom as highlighted in the pic, copy paste all i'ds to notebook word etc, open the save you wan't in package manager now delete all the i'ds from the save you got then simply add you're i'ds from notebook in the correct order it was in when you copied them from you're profile then mass resign.
If people would just search the forum.. you would have came across a tutorial I made literally a week ago.. http://www.xpgamesaves.com/topic/100320-tutorialpicturesgamesaves/