I'm glad Deathoftime was able to help. I never really customized packs with 1.7 (just added or disabled mods) and really just started playing with config files for 1.9 and 1.10 packs, since so few were available (I figured I'd find issues I'd created easier that way )
It's not just simply a customized mod pack. Like I said; on my old rig I can't play modpacks, and I mean I can't play any official 1.7.10 modpacks. My PC can't handle it.
I have only 4GB RAM and an old Core 2 Quad cpu. Because of the horrible resource hunger of the 1.7.10 MC my PC simply can't handle them.
And now I so bored with 1.6.4 packs, I already only playing my own custom 1.6.4 modpack, I'm not interested in any official 1.6.4 pack anymore.
Maybe just when I like a nostalgic play. (Hey, is there anyone who play 1.2.5 MC in 2016? Because I did a nostalgic modded playthrough in early summer...)
So I think I put together my own 1.7.10 mod pack. Or at least I try to make a 1.7.10 pack that my old PC can run.
Anyway, sadly that NotEnoughResources mod not working, it crashes MC when I try to load a world or even create a new one.
Now I'm try a few different versions, maybe one will run, and after that maybe looking at the crash log... Or not, and maybe a better idea if I simply skip that horrible 1.7.10 version and make a 1.8 or above pack.