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I have a 99 Olds 88 with the 3800 3.8 V6, I have a replacement lined up, exact same motor but its coming out of a 2003 Grand Prix, does anybody know if this will be a straight bolt in or will I need to modifications to get in, anybody have any experience with this swap? Thanks for the input.

....love your post.

It's the exact same motor as you say then it should

Yes it will

do some Google research. The basic block may fit but then there is the odds and ends.  
 
Odds and ends such as engine electronics. sensor connector sizes. You tube search also.  
 
What you plan to do someone has done in some sort of manner. A 2.2 swap I was looking at ended up with two choices. The early year engines were a good fit but by only 80 percent. Sensors and some other stuff.  
 
later years were perfect. In both cases the engines fit physically.

Doug said "do some Google research. The basic block may fit but then there is the odds and ends.     Odds and ends such as engine electronics. sensor connector sizes. You tube search also.     What you plan to do someone has done in some sort of manner. A 2.2 swap I was looking at ended up with two choices. The early year engines were a good fit but by only 80 percent. Sensors and some other stuff.     later years were perfect. In both cases the engines fit physically. "

Good positive answer Doug. There can be a lot of little (seemingly) differences in the electrical / electronics end of things. One I saw once the vehicle computer was not compatible with the fuel injectors in the new engine and burned out the injector drivers. There was a 2 or 3 year difference in the engines(Chrysler by the way).  
 
A little research may go a long way toward a successful swap. Good luck

zazzman said "....love your post. "

.....yours too

Talk to the mechanic at westman salvage..he willl tell you exactly what will fit and what will not

If your engine runs well, reuse all the electronics. Then if something is wrong when you start it up it saves the hassle of diagnosing concerns.

I can guarantee differences in sensors and likely injectors as well with a 4 year newer engine.