Voy- you need to retorque the heads, exhaust and intake. My KC 427 was loose when I retorqued it. Then (many miles later) for some reason unknown it coughed the headgasket out between two cylinders. Which I had to pay KC to fix (then found out about the 2-years warranty ???) ...I still love the motor and the service I received.
Here is a good reference:
http://www.boxwrench.net/specs/ford_302_351W.htm