How can u b certain the timing belt is n right

What is your question?

I have a 04 outlander timing belt broke so i fixed that & replaced a couple rods cause they were bent a week later timing belt broke again& this time broke a piston in half n my oil pan since then i got a block & head to a 03 galant so far all my parts match up to it except the exhaust manifold the water pump & the crank shaft positioning sensor how am i to b certain that i have its timing correct so this doesnt happen again