Originally Posted by outback_ute
Won't do much for the originality of your car though.
What you need to be aware of however is that recent magnaflux tests are showing that all uprights/spindles produced for Mustangs between 64-73 are failing due to stress cracks. Now this means bad news... one day either the left or right front spindle is gonna let go, and that'll be ugly. Hence, I'm happy to keep all the original parts and install newer technology in this instance because it's all bolt-in, superior, and doesn't cut up the car in anyway.
I don't ever intend to sell the car, hence, the question of "originality" relates more to worrying about what other people think than what the owner thinks.
Also, it's worth noting that the great man himself, Mr Shelby, actually asked for the famous TCP front suspension to be fitted into his prized GT350 Build # 001 for exactly the same reasons. My thinking is this, if Mr Shelby is happy to retro-fit superior bits to his own GT350, then so long as I can keep the original parts, I'm happy to do so too.