The 98 and prior 5 cyl intake cams have 3 holes to hold the rotor in place. The cam covers also had 3 holes for the distributor cap.
The cam sprockets do not touch anything except the end of the cam, so the cam seals should be just fine. So long as the 3 holes for the sprocket are still in the proper place, should be.
Of course, the 1998 ECU never heard of VVT, so there can be no error code if the sprocket moves a few degrees. You are correct about performance.
I wonder if the intake and exhaust cams can be moved from the 1998 to the 1999 engine??? The cam covers should be the same in that regard. That would save a lot of machine work.
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Keeping it running is better than buying new
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