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Hi Mikey and welcome!
You may have multiple issues here, so let's tackle them one at time.
1. cam-timing take off valve-cover, rotate engine by hand to TDC and verify each cam is oriented correctly.
2. valve-clearance adjustment. Out of spec clearance would prevent engine from starting... well, depends upon how far out they are
3. ignition. Pull ignition wire and stick spare plug into it. Lay on top of engine so case is grounded. Crank engine, do you see a hot blue spark?
4. fuel. Most likely culprit. Visible wet fuel on plugs means you're getting, way, way too much. Liquid petrol does not combust. My school shop teacher shows us scary demonstration by throwing lit match into bucket of petrol! It went out! Only when you vapourise small amount of petrol with lots of air does it ignite.
Probably someone previously thought more fuel is better and monkeyed with your carbs to add more fuel. Verify all jets are factory-sized and idle-mixture screws should be 2.5-turns out.
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