can someone tell me if the 3.8 from a 2002 impala fit in the 1997 buick park avenue both non super charge of course

like to hear from anyone before starting this project

i was told by g.m. that the system management maybe incompatible
but from them this may involve changing wire connecter lol

can i change the computer box at the same time ?

Your antifreeze in motor could be caused by the upper intake manifold. there is a problem underneathe the throttle body where the egr tube burns a hole thru the manilod into the antifreeze passage. replace the upper manifold and no more leak