i for got to mention when use ing the ace editor with the 727 make sure u put a notepad description file in the texture folder you want to install
eg
[texture]
sim=cs727200
ui_type=727-200
ui_variation=Braniff 300 , 2009 NP
description=727 Captain: 727-200 ADDON Pack v2.0\n(c) 2009 Captain Sim www.captainsim.com Braniff 300. \n Repaint by NATH2889.
atc_id=300
atc_airline=Braniff International
atc_flight_number=N300BN

make sure you save it as Description txt and place in the repaint folder
im not sure about the 757 as i don't have it but it should be the same  but maybe save the description file as livery