The 4.1 v6 was a base engine in the b-body line for a while so the mounts are available - no shortage of room in the engine bay!
I used to play with b-bodies and have beefed up the suspension with the 9C1 impala cop car steering gear (like the GN fast ratio), wagon front sway bar, 9C1 rear bar & springs, etc etc.
GM built an experimental b-body wagon in 88 or 89 (I have a cutout from Car & Driver)...should/could be lots of fun.
Also, there's a guy who just posted on gnttype.org in the parts wanted that actually has an '85 lesabre with the 3.8 turbo already in it.