It seems like you need to slow down and look more into what you are doing... You say you researched alot yet when u fixed ur head gasket u didnt have it properly machined and lead to a reoccuring problem....
So maybe before jumping into this you should research more, before u waste any more money....
and the 7MGTE is a good engine, why not just do a complete rebuild on what you already have... besides you will find much more help here with that than with a engine not many here deal with on a regular basis
or i mean you could just drop 23k and pick this up
700HP 3SGTE Motor