Help bad manifold leek !!!

hello everone,
Im glad I found this site. I own, finaly, a 2000 gmc sierra 2500 6.0 vortec iv had a bad leek from both sides of the manifolds for some time now it started out as a soft tick/tock noise and steadley got worse over about 4 months. there are several bolts that have been broken off but will still be able to be removed with kid gloves .My question is this with the truck having 169,000 miles on it hard miles from both snow plowing and pulling a 24' trailer 7 days a week 5 hours a day would it be more apt to replace motor for $2000.00 or worse case senerio manifold heads and valves .Which will be greater in price I have priced out motor but i have not tooken the truck in to be looked at as of yet . price is a big deal wear i live and i dont want the ball to be in the dealers court i would rather have all ball control when im there. Can anyone give me a rough estimat what it would cost to have this job done.Im going in for all the recalls on the truck this week and my diss will be made with all of your in put thanks jay

any body out there 25 people read it

If you can get a new motor installed for 2K I'd do it.

For 2 grand I would go with the new motor. Plowing and towing are hard on them. If that truck had that kind of use I would check the tranny over good also.