I would have to think that the *89 is a misprint!
The most I've seen is *45 with *46 interference some feel the 1* is better others seem to stick to 45-45*
The kohler blocks are pretty stout and while a torque plate has many virtues,
It is my feeling that you just will not see the benefit of finish honing with one installed.
FWIW,
Usually a torque plate is made out of thick steel, not the aluminum that the head is made out of.
You can go to parts tree . com to see if oversize valve stems are avail.
Some valve recession into the block takes place, so I would try to stick to specks not tighter, you can always take more off the valve stem but to decrease you have to deepen the valve seat into the block making grit to get into the engine, if you know what I mean.
and if you try to take it off the valve seat, it starts to get thin in a hurry.
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