Tail pipe is rusted, want to replace muffler and pipe

2 darts is on the right track, never used classic but Accurate LTD has a full 2.25 system. For the money i would just go to a muffler shop and have them do a 2.25 system from the exhaust manifold (they will want to go from the about the trans crossmember) to the the muffler, then 2.5 to the bumper.

for the muffler i would go with the flowmaster Delta flow 50 series. Its just a little louder than stock, much better rumble, and increased performance/mpg over any of the perforated tube BS.

while your at it buy a 2.25" thick exh flange so you dont have to use the old thin one and buy a Remflex gasket.