I have a 94 4Runner with a cracked block I'm wondering if I can swap the stock motor with a different type of motor like a 350 with out too much difficulty. If anyone has done this could you please help out with the best plan of action
Welcome to Toyota Nation.
There's lots of motors that have been swapped, non are simple.
You didn't say what motor you have, but if it's the 3.0 V6, the closest thing would be the 3.4 V6. It's not a direct bolt in, but at least it would mate with the trans.