One thing to know about LEDs is that some manufacturers use equivalency ratings for advertising. They call it 1000w but if you read the specs they say "but consuming only 110 watts".
You want a minimum of 35w per sq ft for led. You are in a 2x4 that's 8 x 35 is 280w. You would be able to get away with a single 240w quantum board. But you would need 2 and a half of those ones you got.
It will work, but your results wont be that great. Quantum boards are quite cheap now, I'm not sure if anything beats the light output per watt of lm301b quantum boards. I'm in Canada, it costs about $200 canadian for a 240w kingbrite lm301b + red quantum board kit, with everything you need to hang it.
What I do is hang the fixtures by chains and s hooks from the top of the tent. That way I can raise the light up to like 8 inches from the top.
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Then just dimm it as I need. Gives you more room too. You can also mount the driver outside the tent, to remove a lot of the heat.
A lot of us are running that very board and many like it. Just ask away if you have questions
