Welcome to AF !
If you have the money anythings possible.
But the newer Achievas came with the 3.4, not a 3.8.
Both of which would require not just mechanical modifications to get the biger engine to fit, thiers a bunch of electronic(computer) problems which require a great deal of knowledge on how each system works and how to get them to all work together.
Even the 3.4's swapped with a 3.8 S/C requires piggy backing PCMS and BCMs. A lot of man hour in this type of project not to mention the money involved.