If you want period correct, my 1965 Mustang had US Indy Mags, 13" in the front, with wrapped coils, L60-15's in the back with Gabriel HiJackers, headers, glass packs, and an open mesh air cleaner, among other things.
Gas fill was shaved off and relocated inside the trunk (stupid I know), no rear seat, and a used roll cage.
The transmission shifter opening was cut to accommodate the 4 speed transmission and shifter I got from a Falcon.
It also had a hood scoop off a 1969, and was white with blue metal flake along the sides, the rear tail light panel (which had 3 65 66 tail lights on each side) and along the sides of the hood scoop, and a BIG set of driving lights in the grill.
THAT IS PERIOD CORRECT, well, at least, in Los Angeles.
ed ay +3112
1968 GT500 Arrest Me Red (The Big Boy Toy)
1966 K Code Vert (The K 'Vert)