4-Runner needs Help

Hi folks, I came by an 1995 4-Runner of a friend, his girl ran it very low oil, it doesn't run.  The 4-Runner is good other wise.  My question is that it has an 3.0 V6 3VZ-E engine.   Will an 1MZFE engine fit in it???   Will a 3.0 V6 out of a Avaion/Camry fit in the 4-Runner??   I am just a Texas kid that is learning about Toyota's, so please pass on any information you might have.  I would be very happy.  
You'll have fun!!!!!!

Upgrading it or overhauling the current one might be nicer.  Otherwise buying an ENGINE outright isnt all that bad price wise.  The current engine might be still good just as long as the heads arent warped.