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I am not sure what a ' valve guide seal' is if it is not a valve stem seal...which Skippy mentioned.... smoke upon startup which clears up after a few minutes is classic worn valve stem seal symptom. They are not expensive and with care can be done by a DIY 'er.
Since you will have the valve train opened up I always suggest putting new springs since they are cheap and new valve caps and locking nuts since they affect the ability of the valves to hold valve clearance specs well ... as per the FSM suggestions....
I also suggest putting new rotators on all valves at that time if you can find them. This is also per the FSM suggestions....
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