Wait a sec...do you mean the original USS Porter or the DD-800 late war Fletcher???
If that's the case...then you still have alot of work to do...
The Tamiya Fletcher is an early war ship, and round bridge, so you'd need to get the Tom's Modelworks square bridge conversion kit, and depending upon what period of time you wish to model her, she did receive an Emergency AA fit, which means you land the forward torpedo tubes, replace them with a platform for the MK 52 fire control directors for the quad (MK II) 40mm AA guns amidships. She also replaced her single 20mm with MK 5 ring sights with twin 40mm with MK 14 targeting computers.
She also would be carrying Mk 3 or MK 9 depth charge racks instead of the earlier MK 1, possibly with Mk 1 track extensions, and late-war depth charge loader racks for the K-guns.
Hope that helps.
Jeff