#1
Would it be ok to replace my stock bugera 6262 212 combo speakers with an eminence patriot texas heat and a hellatone 60? The impedance for the original speakers are 8 ohms and they are both 70 watts.
#2
As long as the impedance is matched you will be fine.

If the speakers in the amp are each 8 ohms you'll need 2 8 ohm speakers. If they are 16ohms you will need 2 16ohm speakers.