Question on creating a modpack and ID conflicts/ore world gen

[Robet24]

So all day I have been in the process on compiling a list of mods for a modpack I would like to submit. I have reached the point where I need to go through the configs and make sure recipies and difficulty are where I need them. As I was on this step, I realized ID conflicts and ore world gen (this popped in my head as I was writing this) might be a problem. Are these two things something I have to make sure are correct? Or does minecraft or forge have something built in to fix these?

Side Note: Going to probably run a 1.6.4 modpack

 

[Watchful11]

I would seriously consider choosing to go with 1.7.10 instead. ID conflicts are a large problem in 1.6 packs, especially for someone who is just starting out, 1.7 eliminates block and item ID's entirely, so there can't be any conflicts.

You will still have to turn off some of the ore gen so you don't get duplicate ores.

 

[Havanacus]

If you do stick with 1.6.4, be sure to search your Forge-0 file for key phrases like "conflict" and "error". There are a lot of Warning and Info lines in there that might worry you if you're unfamiliar with debugging Minecraft, don't worry so much about those. After you find conflicts by searching your Forge logs, you can solve them easily by removing on of the conflicting mods, loading the game, and using NEI to dump a list of IDs. I find it helpful to show used and unused IDs, you're going to be looking for large empty spaces you can move a mods items to. In 1.6.4, items in NEI are sorted by ID, so you probably don't want to split them up.

In you move on the 1.7.10, which you really should if you can, item IDs won't be a problem, but Biome, Enchantment, and Potion IDs may still conflict between mods. It's not likely but always check your logs before shipping a modpack.