The splice function is one good way to go, you could also rebuild your array using array slices:

$ perl -e 'my @a = (0..15); @a = (@a[0..7], $a[8].$a[9], @a[10..15]); 
+print "@a \n";'
0 1 2 3 4 5 6 7 89 10 11 12 13 14 15
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