In addition to the above replies, you can also set your path such that the first perl to be found is the AS perl you installed. In your .cshrc/.tcshrc/.bashrc prepend the path to ~/bin instead of appending it.

Specifically, in bash it would look like:
export PATH="/Users/punkish/bin:$PATH"

So perl somescript.pl will call the AS perl, as it is the one found first. (This last line included in accordance with standards set forth by the Department of Redundancy Department. Oy.)