A real Formula S car would have a front sway bar, the heavier duty .870 torsion bars, 14x5.5" rims, 4 bbl carb, the black wrinkle valve covers, HD leaf springs! You can tell by looking at the intake bolts whether the motor is a 65, they should have a 1/2" head and 5/16" threads! If a 9/16" socket fits correctly on the bolts, it is a 66 or later motor! No way to tell just by looking at it whether it is actually a Commando motor or not! The fender tag will have the numbers "32" under the ab letters to signify a Formula S car!
As for rare parts??? Not really rare, but the drivers side fresh air vent box under the dash always has a rusted out hinge on the bottoms of the door, the rear window trim is usually always pitted! Rare is the rear window defrost option, disc brakes, which were a late 65 option, the dash mounted tach and bezel to the left of the steering wheel, power brakes, Commando exhaust with resonator!
The single biggest area of rust concern would be up under the dash where the fresh air box mounts to on the drivers side, and the heater mounts to on the passenger side! The bell flange holds water from the cowl, rusts the bottoms of the flange, drips water on the floor, rusts the lower door hinges on the heater and vent box, and it's not an easy fix! There's not a lot of aftermarket support, but parts are out there, but the cowl is a pretty big fix!!
Hope this helps some!! Geof
