thermostat suggestion

I'm getting ready to change out my thermostat on a 1994 Cobra...

Should I get it for 160 or 180 degrees?

Here's a brief list of mods that might help
play a role in your suggestions: (dunno?)

1994 Mustang Cobra 5.0
------------------------------
Trick Flow Heads
FMS E303 Cam
Roller Rockers
Reinforced Rods
70mm Throttle Body
75mm MAF
Shorty Headers
H-pipe w/ Cats
1 Chamber Flowmasters

Thanks!