oil leak among other issues

08 Honda odyssey touring oil
i have a oil leak around passenger side vvt spool valve but also come from top of engine in the center just had valve cover gaskets replaced going to replace vvt spool valve but wondering where leak is coming since its in the center could it be rear main or valve cover gaskets its coming from back of engine area near top

2008 honda odyssey touring
129k miles on it

also a strange clicking when driving at 45+ mph from front of car when pressing accelerator buts intermittently comes and goes

clacking sound also when i change from d to park no codes

also a snappy sound when i back like on a incline or steep hill

let me me know if u can tell me what i need to have replaced

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