It's all personal preference. Like mustangII said, and the way I look at it is, the only reason to keep it original is as a collectors car or show car. I'd get bored and frustrated real quick with the old technology. A modded car will perform better and be a whole lot more fun to drive, not to mention work on. Keep in mind that stock with new brakes, and just a few engine components isn't stock anymore and turns into "lightly modified" which is probably the least fun/valuable of anything.
Good luck!
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1966 Mustang Coupe
302- C4. Edelbrock RPM Air-Gap intake (p/p), RPM hydr cam 224/234 duration .496/.520 lift, 600cfm carb, full 2.5 dual exhaust, Hooker comp headers, full MSD ignition, port/polished stock heads, full alpine system and stock cooling =\
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