I keep snakes and I have three ferrets. They never meet. EVER. And they never should. A ferret would more than likely kill a snake as they do occasionally in the wild, but by no means would the smell of a snake make them "go wild". They don't usually eat snakes, their main diet consists of small rodents and the occasional bird.
You'll be perfectly fine with the two species so long as they NEVER EVER EVER meet.