Potentially dangerous (untested)...

perl -i.bak -ne's{^print\s\"(.*?)\"\;$}{my(@str)=split(/(.{76})/,$1); 
+"print ".join(",\n\t",map(qq,"$_",,@str)).";"}ge;print' file
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update

#!/usr/bin/perl -wT
use strict;

while(<DATA>) {
    chomp;
 
    if( m{^(?:print\s\"(.*)\"\;)$}g ) {
        splittor($1);
        next;
    }

    print $_."\n";    
}
exit;

sub splittor {
    my $str = shift;
#    my ( @str ) = ( $str ) =~ m/(.{1,60})/gs;
    my ( @str ) = grep $_, split /(.{1,60})/, $str;

    print 'print ';
    print join ( ",\n\t", map {'"'.$_.'"'} @str );
    print ';'."\n";

    return undef;
}

__END__

print "I am smelling like a rose that somebody gave me on my birthday 
+death bed, I am smelling like a rose that somebody gave me ... yeah!\
+n";

print "123456789123456789123456789123456789123456789123456789123456789
+123456789123456789\n.";


###### this is what the output shoud look like (does look like)

print "I am smelling like a rose that somebody gave me on my birthd",
        "ay death bed, I am smelling like a rose that somebody gave m"
+,
        "e ... yeah!\n";

print "123456789123456789123456789123456789123456789123456789123456",
        "789123456789123456789\n.";
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______crazyinsomniac_____________________________ Of all the things I've lost, I miss my mind the most. perl -e "$q=$_;map({chr unpack qq;H*;,$_}split(q;;,q*H*));print;$q/$q;"