Can two 1300 subs work with a 1200 amp?

Yes, the sub will work fine. Speakers ususally have two ratings, RMS which is constant power handling and peak power- meaning it can handle peaks of the higher rating. If your speaker is rated for 1300 watts then that is likely the peak rating. It is better to use speakers that are rated for more than the power of the amp you are using so there is no chance of blowing the speakers. The speakers will also produce cleaner sound when the amp is running close to capacity without overdriving and distorting the speaker. Also, if the amp is a stereo amp rated for 1200 watts it is only putting out a maximum of 600 watts per channel.