Usually power is rated in three different formats (Peak to Peak, RMS and Average). Here are the formulas for coverting between the three:
Vp = Vpp/2 = sqrt(2)*Vrms = pi*Vav/2
Vpp = 2*Vp = Vrms/sqrt(
Vrms = Vp/sqrt(2) = 2*sqrt(2)*Vpp = pi*Vav/sqrt(
Vav = 2*Vp/pi = Vpp/pi = sqrt(
where Vp = Peak voltage
Vpp = Peak-to-peak voltage
Vrms = rms voltage ("effective voltage")
Vav = average voltage
pi = approx. 3.14159...
sqrt(2) = square root of 2 (approx. 1.41421...)
= square root of 2 (approx. 2.82843...) = 2*sqrt(2)
Generally I would suggest that you would use the RMS power rating if you are using an AM Carrier. This would come out to approx 176 Watts for your application.
Hope this helps.