Code says you can put 5 #8 thwn/thhn wires into 3/4 pvc conduit.
With one #10 and 3 #8's you should make it.
Make sure the wire is rated with THWN for a wet location.
MC cable would not be allowed inside the pipe.
And the #8 being run in conduit has to be stranded. The #10 for ground can be solid or stranded.
Also, 2 of the #8's can be any color other than white or green, black is the most common. 1 of the #8's has to be white. The ground wire has to be green or bare. I'd used #10 green stranded or #10 bare soild.
Just because you can, doesn't always mean you should
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