So i just figured out that i have a cracked block. Im trying to figure out what to do it's only a small crack but enough to make my truck run like junk. Which would be the best road to take. Replace the whole engine if so where would the best place to be to get one for a fair price. Or to seal the leak but how to do just look for so help cause im at my wits end with this truck.

 

Also its a 2000 Dakota 3.9L with 108,000

 

How did you crack the block? A cylinder head I could see.

Try a boneyard. There should be a good number of 3.9's out there.