In the old days, a good clean meant "draw-filing" the block and the head. With the Supra, i dont know if I would do that, all depends what you find. I would go ahead and then take pictures of your block and head surfaces and post them up here for us to peek at and then it will be easier to advise. The more pictures the better advice you will get. Also, note the spark plug condition of each cylinder (line em up and take a shot - in order...) as they also can tell a story. Expect to find oil in the spark plug galley if the valve cover gaskets were leaking (very common with the 7mGTE). You should use something like rags or a turkey baster to remove that oil so that it doesnt give you a wrong picture of the pistons when you remove the head if you pull the plugs first.
Good luck!
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