lookin good, It looks like you got some smoke goin' on now.
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The sirloin tip roast works well for roast beef. I would leave it whole and use a simple rub consisting of salt, pepper, garlic powder, onion powder, and some type of chile powder (I prefer chipotle). Apply your rub, smoke to about 140* internal temp and then slice. That should easily fit in your 5 - 7 hour window.