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I series Carrera 3.0 were model year 1976
J series Carrera 3.0 were model year 1977
I can tell that your is a J series from the large central air outlet in the dash
The chrome trim is unusual for a C3, most have black trim
The sport option(put together by/for the English importers) consisted of front and rear spoilers and 7/8 x15 Fuchs w/ 205/50//225/50 tires, in '77 for the J series cars the optional wheels were 6/7 x16 w/ 205/55//225/50, the wheels were also available separately
all used the same engine 2994cc, 200hp, 930/02 engines and A/M brakes w/ 282.5/290 x20 mm rotors
I series used a 19.05mm unboosted m/c, J series used a 20.6mm boosted m/c
the second power mirror was an option often not selected, like lsd, as were the spoilers in most markets
tempostat(aka cruise control) was standard but was/is a pia to keep in operation
Bilsteins were standard on all I & J series C3s
the I series used a 915/44 5speed, J series used a 915/61 w/ improved syncros but was otherwise identical to the /44, 1/2 way thru the '77 MY run the trans case was changed from mg. to al.
I did change my 5 blade to a later 11 blade as the 11 blades fans do flow more air even if the pulley ratio is altered(even more if the stock pulley ratio is retained.
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