Timing Chain Tensioner Question?

I have read about using Magnum tensioner on a LA block, but when came time for me to install the timing chain on my new motor it's hard to see this tensioner would work?20180523_142900_resized.jpg

If you look at the tensioner arm to the right of the photo it needs to move over about an inch to the right to the other side of that metal tab that sticking out. But as it sits the chain doesn't have much play left. Has someone successfully done this? Am I missing something?