Sounds like a nice car but like the others have said, 16K appears to be high.
In real estate, the primary consideration is location, location, location
With classic Mustangs, the primary consideration, for me at least, is condition, condition, condition. Having saidthat, orginality also greatly influences the value. When I look at a car that has been modded, I try to figure out what its going to take to return it to its original state. Things like fender flares, tubs, non-standard paint quickly jack the cost to more than the value.
From what you described on yours, most of your mods could be easily removed, whcih helps to return some of its value.
I bought a mostly restored 72 Mach 1 in Jnauary. I looked for a long time to find the right car and finally found it in British Columbia. I paid $8200.00 for it. Its value is probably a little higher in the States (maybe 10K).
It seems to me that the mods you have described would appeal to a younger buyer. But, remember, once the value goes above about 10K alot of those buyers can't afford it. Older guys like me are looking for originality and condition.
Hope this helps.
72 Mach 1 Q Code, 71 Mach 1 M Code, 97 F150 daily driver.