Some AMT kits came with them in the early sixties; right now I can recall the '63 Buick Electra and Riviera had them (the Riviera's was supposedly chrome per the instructions but looks the same otherwise).
As everyone no doubt is sick of hearing, I've got '61, '62, '64 and '65 projects going. Nice kits with a few quirks (hood contours on the early ones, front bumper/grille fit problems with the '64, window shape at the drip rail on '64 and '65, installing the '65's hood without breaking the pins off, etc.) You were lucky to find a '63 sedan; seems like '62 convertibles show up much more than anything else. There was one '61 two-door hardtop made, a factory prototype; it looked as you might imagine - same roof, longer door, that's it. As for an engine, maybe a Ford 427, 460 or SOHC to keep it in the family?
Sonny Corleone probably would have had a slabside Continental if he'd lived long enough...
Oh, man... I'm still kicking myself for giving one of these to a friend when I left CA (decent shape - missing wheels and engine, grille modded with the "V+" from the '57 Meteor grille, but unpainted and not a gluebomb), but I wasn't in my right mind... plus it had a pedigree; it was one of the lot of models I got from H.B. Halicki's estate. Maybe my friend would sell it back to me? Hmmm... Actually those are the chrome reverse rims that came with the kit; I believe the '60 Vette kit had them as well.
Remind him that the tooling has been lost since about 1969 when it was last issued in the "Baja" series - if it still existed AMT would have reissued it several times by now (like the '61, '63, '64, '65 and '66).
Many did not. My Spanish teacher in junior high gave us a graphic description of the collision that killed one of her friends (driver, crushed by the steering wheel), disfigured another (middle front passenger, face hit shift lever and dash) and injured her (right front passenger, leg broken in two places against the dash - and further injured when an equipment box fell on her in the ambulance). It was probably the only time I saw her get emotional.
There is a certain subset of collectors who will fight each other tooth and nail (or checkbook and platinum card) at auction for very-low-mileage cars even if the car itself isn't too exciting a model. Key term being "at auction". If this had been consigned to some vintage car dealer at that price, I bet it would have sat for a long time.