Sounds more like valve seals to me. My 88TE was using a similiar amount of oil @ 115,000 miles, I had the seals done and I later re-sealed the upper chain cover (minor leak). My engine has been clean for 2 plus years now. I use no oil in between changes. Currently at 170,000 and going strong.
I think the valve stem seal job was about $400.00. I would look into that before jumping into removing the head. If you had 200k on the car then I would be inclined to think guides.
EJC
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