Like 805 said, SBM is a small block MoPar. Abbreviation's are common and send me for a stall while I figure them out sometimes. LOL
and is more stall good or bad?
Again like 805 said, more stall is fine. It's only 400 rpm or so as said before. More stall allows you to possibly get off the line quicker. This should be absolutely fine for what your doing. Even if you put in a small cam.
[so is there anything particular i need to watch out for when swapping / installing? thanks
The /6 has a 904 trans and if the same style (904) trans is what the 318 has, there should be no problem at all, just a direct swap.
Save the old parts and re-use them as needed. (New stuff is better of you have a few coins for it)
Just use common sense, think, look, think again while doing thisand you'll be fine. Be careful, and enjoy.