I copied your code and data verbatim and it works for me.
howard$: cat input.txt
77 * 10 0 * * 0 340
141 * 40 0 * * 0 240
howard$: perl -lane 'print "$F[2]\t$F[7]" if $F[7] > 0' < input.txt
10 340
40 240
Environment is AIX, Perl 5.8.8.
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