Termi rods are fine at 700. The stock rod bolts start to get questionable at 700. There are tons of Cobras running between 650-700 safely. Its the stock bottom end 302s from the foxbodys that are more limited around low to mid 500s. They are completely different motors.
ARP 2000 rod bolts are a cheap and easy upgrade to the Termis.
The weakness on the foxbodys is the block itself - internals hold up longer than the block.