RDAF F-16A

What you need is:

Replace forward part of gun port With old-style gun port - Hasegawa part will fit but fine tuning needed.
Early undercarriage with lights in main Wheel weel - found in the Block 25/32 boxing
Block 5/10/15 main wheels
New instrument panel representing the Block 5-15 Version (not MLU as out of the Box)
Small style stabilator if you build an early Block 5/10 version. Check Your ref's
Modify top of tail to represent the F-16A. Basically removing the RWR of the F-16C. This can be filed down and rescribed.
Use the 16S210 rails (found in the Block 25/32 boxing)
replace tailbase with either ADF or Parachute base depending on version
Remember to check Your Reference pic's for the Version you are to build. The ADF newer flew with the small tailplanes, and many F-16A Block 5/10/15 had the gun ports replaced with the New type that comes in the kit