I would say it would be plenty for what you are wanting to do. A C series diesel is rated around 80 HP which is mone enough to pull a baler. We use newer JD's for haying and run 70 HP tractors to cut bale and roll with now problems. heck we used to pull the round baler with a JD 5500 which is around 60-65 horse with no probs at all. 

  Besides. I think that 80HP in the mid 60's is more usable power than 80HP in a tractor built now is. I just bought a 1800 B series diesel for a third tractor in our operation and have no doubts it will pull anything I can hook it to.