Boo,
Would
this be yer sweet Ebay secret?
But to answer your question, no you shouldn't need any mods whatsoever to get that trans to fit your truck. Not if you have the small, standard shift three speed (or 3 speed auto) in it now. It'll even use your old yoke!
Considering what these have gone for on Ebay lately I'd say that $200, for this tranny with shifter and all, is a
very good price (though I paid $107 for my last one with shifter and all, but it has a cracked input retainer bearing housing - but I don't care, it's just another spare). And you're getting the matching bellhousing (and yours appear to have that Mopar-like pattern) - getting the correct bellhousing for that style/casting tranny is very important.
Try going to a tranny shop and getting a price for a rebuilt one (if he can even
find one!) - in this area a shop gets upwards of $900.00 for one.
-ftyler