I agree with both. A valve check would be quickest, so I'd get that out of the way first. Compression check will tell you if he burned up the rings when the float stuck open or if the float became stuck after it wouldn't run.
If you didn't split the cases, you'll need to put some oil (at least a quart) in the timing mark hole to help lube things up while you crank. Degreaser probably wasn't the best thing to use as it leaves a residue that won't allow oil to get to the moving parts very well.
If those are both good, I'd check his buddy's work on the carb.
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.