wonder if he really came from nasioc.... jk. I say go for it man. Its your car, and Im sure there are some buick forums that will be able to help you out on this adventure. might want to check with sl-i.net and legacycentral.org , search for "H6 swap" on those. some kids there took their 2.2's-2.5's for the H63.3 (svx) and the newer/older H63.0 (outbacks). thought about doing something like this with an older (91) legacy wagon. I wanted to put an inline 4 cummins'. after looking at the info on parts etc I came to realize something about subarus... they are awd with a boxer. the suspension, engine mounts, physical structure/stability of the car is designed for the origional engine. primarily with the suspension. it is not out of the realm of posability, they did make an LS1 powered Legacy GT. RWD of course. I googles it.