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When you pull the head off a high mileage engine . . . . its a real can of worms.
Like Donavery said, shaving the head means you have to buy adjustable cams. Which I have done. Since my head was shaved to hell and back by my local hillbilly machine shop . . . whether the adjustable cam gears will fix it or not . . . is a good question.
An old head will need valve seals. To get at those you will need a valve retainer installer/remover.
If your valve guides are worn out (which they will be), you'll have to get a machine shop to punch the old one's out, and new ones in. That'll cost somewhere between one and two hundred dollars.
Your valve seating will be changed by the new valve guides. You'll need seats cut, and the valves lapped in. The valves need to seal pretty much watertight.
Since you've cut a new valve seat, you'll need a serious valve adjustment. Meaning probably a whole new set of shims of the thinner variety. The shims run somewhere between 6 and 8 dollars a piece. Also, there's a special tool available for valve adjusting. Though some mechanics get by without this tool.
There are a few other "ought to's" like buying all new valve stem retainer pieces, which my local parts store charges 9 dollars a piece for. And there are 32 of those puppies in the head. I lost a couple and found out how much they cost the hard way.
Heads wear out. And reconditioning them to very good condition is a lot of work . . .. . is all I'm saying.
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