lots of available replacements!
the 3.8 sII are sure plentiful but the installation would be shortly followed by statements like
"were did the crank go?"
"i cant believe i spent all that time getting it to fit!"
"who put grey toothpaste in my oil?"
well realistically, if you did the engine swap, as long as the boost was kept down, the motor would live.
a 4.1 cadilac would get the horses without the boost