I would get a set of Hooker headers (#6111) and a true dual exhaust with 2.5" pipes. The muffler choice will depend on what kind of sound you want.
Take care,
~Chris
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MustangNet
RACECAR spelled backwards is RACECAR
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'64 Falcon/Ranchero: 302+.040, 10.5:1, .475", 282 Dur., Perf. RPM, Holley 750 Dbl Pumper, MSD, 4-Spd., 8.8 w/3.73 posi. = 12.888 @109 MPH