Default [Q] AT&T sgh-i747 custom rom

I have an AT&t galaxy S3 SGH-I747 and it is rooted and has twrp installed. it is currently on android 4.1.1 and I want to install TheCollective*[12-28-13] AoCP - CP7.0 {4.4.2} for I747. My bootloader is currently DLK3. Do I need to update my boot loader before I flash this rom and if so which one should I flash? I have spent a bunch of time searching here and have not found a direct answer to this. I realize it is no joke flashing bootloaders and I don't want to do it if it is unnessecary. any help on this would be greatly appreciated!

thank you