An outstanding resource for this subject.
"A Table of Parallel Passages in the Gospels" (HSB, 1653-63)
Wallace, "The Synoptic Problem"
This link takes you to an article defending "Markan Priority" by a conservative New Testament scholar who teaches at a prominent conservative evangelical theological seminary in the USA. Much of it is based on Robert Stein's fuller treatment of the issue. Stein is also a conservative. Stein's book and this article are models of lucid, reasoned argument supported by evidence, and amply demonstrate why literary dependence among the Synoptic Gospels and the conclusion that Mark is a source used by Matthew and Luke are the theories accepted by nearly all biblical scholars aside from some fundamentalists. Finally, regarding the article's conclusion, it should be noted that most scholars are not convinced that Mark is much earlier than 70 C.E.