What are the getting and setting block methods for 1.8?

If there are none (which I highly doubt) how can I make my structure generate in-world (I already have the IWorldGenerator set up).

So far I have found a set block method but no get block method. I need the get block method for detecting what the top block's y coord is at the specified x/z coordinates. I need the y-coord so that my structure doesn't spawn in the ground, or in the air.

world.getTopSolidOrLiquidBlock(pos)

is what you are looking for

Yes, thanks. Also how do I use IBlockState to set a block? It's an interface so I can't instantiate it. Is there a method somewhere kind of like getAxisAlignedBB that returns it?

Use

Block#getDefaultState()

for standard blocks.

I'm not sure this is how IBlockState is supposed to work but I'm using this code to spawn my block (x/z are random coords from IWorldGenerator):

BlockPos block = new BlockPos(x,0,z);

block = world.getTopSolidOrLiquidBlock(block);

System.out.println("Top Block is:"+block.getY());

IBlockState state = Ancients.invincible.getDefaultState();

world.setBlockState(block, state);

That should work.

It gets the proper block, but it doesn't set the block to my 'invincible' block. Did I miss a method that I need to use?