Are there any block game engines out there or would I have to start from scratch? I don't want to make a minecraft clone or anything just a game that uses blocks. Thanks
Is your game restricted in a small amount of place or do you require an endless world with infinite blocks. If you want the larger world you need to redraw the geometry.
well then it would be a simple of matter of just instantiating objects and deleting them as you need. Most engines should handle that out of the box.
unity would be fine. I made a quick minecraft clone in AR if you look at my twitter feed you can see a few screenshots