I've been GM for years, The last non GM I owned ( Besides the Harley )was a 70 Coronet 500 with a 383 pistol back.. well way back.
Since I've had a 69 Judge ram air 3, 4spd, 86 Pont 6000 (275k and only put a rack and a distrib modular in it and still was decent when I parked it) 76GMC plow truck still have I think? , 85 burban plow truck that I still have, 95 9C1 ex Il state patrol I still have, 68 Camaro rs BB 4spd 12 bolt I still have, and last but not least 2000 Silverado Z71 Excab, 4dr not 3, 4X4.
Yes it is like a used car lot!!! One per decade.
I enjoy working on vehicles.

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Nice collection.

Does your 9C1 have the LT1 engine?