6 to 8 Cyl.

http://www.engine-swaps.com/ , is the site which you will find the swap kits. I did a small block to big block swap. Very very good instructions and material in the kit. Easy to do.

The swap could use upgrades like listed above. Brakes, cooling, rear. You'll need a new drive shaft and perhaps a shifter for the small block tranny. The /6 tranny will not fit.
Other than a T-bar upgrade, sway bars are a good idea. Click here; http://www.swaybars.com/