First let me say that my memory isn't really accurate. :-) I don't recall any '64 models factory equipped with the cammer, so I doubt the factory built any T-bolts.

AS I recall, there were two '65 comets with cammers, Nicholson and the Super Cyclone, maybe a Mustang fastback or two for A/FX, in '66 there were the "long nosed Mustangs" of Gas Rhonda and others, Stone Woods and Cook ran a Mustang nitro Funny, 6-'66 Comet funny cars, Jack Chrisman's was supercharged, a Ford built dragster/show car called the Super Mustang, Kalitta, Prudhomme, Hoover and maybe more in dragsters, in '67 another fleet of funnies including a topless roadster, George Montgomery, and Maybe Skip Hess in AA/GS, and by '68 there were a lot of Cougar and Mustang funnies running them. In '69 Mickey Thompson had a Mustang funny car that revolutionized the class, and by '70 there were a few showing up in Street Roadster class, and some lower dragster classes.