replacing a 2000 blazer motor for a 96 s10 motor what all should i keep add etc.

 

You may want to search the forum for "engine swap". Many builds which addressed various issues with swapping engines.

First thing that comes to my mind when reading replace a 2000 with a 1996 is: Is it legal in your state? (Usually only newer engines are o.k.)

 

GM Dealer told me the design and build changed in 2001 so Im guessing its an easy swap.