Lets clean this up
1. He bought a jdm 7mgte, if he wouldve bought the 1jz or even a 2jz to swap into it he wouldnt be trading for a 91 integra......
2. The jdm one is no better than the one that was originally with it besides the owner did not want to take care of the first 7m so they bought another one.
3. As others have also stated the headbolt torque is the weakpoint, for oem called for 55 ft lbs which isnt near enough to hold, and usually causes a BHG.
4. As far as capabilities goes, that answer depends on how big your wallet is, or well at least how much is in it.
5. Why dont you just go get 5k and buy my 1jzgte Supra
(oh noes! it has 2 turbos! its gotta be faster!!11!)