Data Plate reads: ( going off of a grainy picture i have so i think this is correct)
050 85
65-44427 KAN 2111
198-8 R-R
1 28FP 3H 4S 5W
Here's how it decodes:
05C = build date of May, 3rd week
85 = Body buck number?
65-44427 = Buick Skylark V8 Coupe
Kan= Kansas assembly plant
2111= 2111st car of that body style off of the line (includes non-GS Skylarks)
198-B = Black bucket seats
R-R = Fire Red paint
Option codes:
1
2B, F, P = 3 speed manual (B), short console (F), Back-up lights (P)
3H = Belt reveal moldings (chrome trim along window/door edge)
4S = Gran Sport package
5W = Custom seat belts
Neat car!
Original would be nice, but it will be tough finding all the GS-specific stuff such as engine mounts, exhaust manifolds, rear sump oil pan, bellhousing, and especially... the clutch linkage.
There are aftermarket options for headers, bellhousings, and hydraulic clutch/release, and even engine mounts, so it is do-able!