Your advice...

So thanks to the Piston slap my engine has and a crappy GM transmission I've decided to do an engine/tranny and exhaust swap. My initial thoughts are the 3.8L supercharged but I'm not familiar with tranny's so I could use some advice. As far as the exhaust goes, I was leaning towards Borla. What what you do if you were to replace all 3 of those? How much would you pay for each?

This is all assuming it will fit w/o problems into my '97 LS