Depending on the engine ball park $700.00 to $1500.00 or higher if the heads are warped etc. There are two heads, never replace just one gasket.
1999 300m
Yes.
No.
For your Chrysler 300M, you can expect to pay around $800 to repair your timing belt. You will be paying more for labor charge than for anything.
5w30
10W3010W30
It has a belt.
5x114.3
You can find a wiring diagram for a 1999 Chrysler 300m in the vehicle's owner's manual. You can also find it at various auto parts stores.
Aluminum..
3,567 lbs. curb weight
It doesn't have one.