Some information about The Asphyxious CustomPack Resource Pack 1.7.4/1.7.2/1.6.4 that you can need before installing

How to install The Asphyxious CustomPack Resource (Texture) 

1.Download the resource pack in a ZIP file format, do not unzip. If you created your own resource pack, you need to ZIP them. For in-depth instructions on obtaining the files to make your own custom resource pack go toTutorials/Custom Resource Packs. 2.Run Minecraft. If you already have Minecraft running, make sure you save and quit the world: you need to be in the main menu to continue (If you have Optifine, you can go to Options > Video Settings while in-game). 3.Click Resource Packs button. 4.Click Open Resource Pack Folder button; this will open the folder where Minecraft stores all Resource packs. If nothing happens, you need to find the folder manually. Depending on your operating system it is: Windows: %AppData%minecraftresourcepacks Linux: ~/minecraft/resourcepacks (This folder may be hidden in the Home Folder) Mac OS X: ~/Library/Application Support/minecraft/resourcepacks (This folder may be hidden) 5.Do not close Minecraft. Place the resource pack (ZIP file) in the opened folder, do not unzip. 6.In a few seconds the resource pack will appear in Minecraft. Select it (may take a few seconds for high-resolution packs), and click Done. The resource pack is now applied, you may now load your world and see the difference. ...

Detail and Download here : Minecraft mods 1.7.5/1.7.2/1.6.4