86 5ktq half year questions....

[Beatty, Robert]

Anyone know if there are any changes to the motor in the half year split of
86?  ie, was the 1/2 half of the year equipped with a different manifold or
something thats not on the later 5ktq?  I know about the G-54 brakes and the
AC controller differences.  What else is there?  Reason for asking is, my
new to me 86 5ktq seems to be significantly faster off the line than my last
87 5ktq which had the same chip/spring in it.  Any ideas?

Thanks

Rob