It depends what you consider "too high".
Couple the CA18DET's shorter 5th gear with the 4.363:1 final drive... revs at cruise will be 18% higher than with a stock KA or 7% higher than what you have now. It works out to about 3100rpm at 60mph.. 4100rpm at 80mph.. depending on your tire size, of course, but figuring you've got something close to stock.
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