from wiki, yes the 250C all had 2.8 M130 engine
Chassis code Years Model Engine Number built
Displacement Model Type
W114.015 1968–1976 230, 230.6 2.3 L M180 I6 221,783
W114.010 1968–1972 250 2.5 L M114 I6 78,303
W114.011 1972–1976 250 2.8 2.8 L M130 I6 34,061
W114.021 1968-1972 250C 2.5 L M114 8,824
W114.023/022 1969–1976 250C/CE 2.8 L M130 I6 42,379
W114.060/062 1972–1976 280/E 2.8 L M110 I6 67,373
W114.073/072 1972–1976 280C/CE 2.8 L M110 I6 24,669
looks like you beat me to it, BUT
my corrections are in the above chart. (in Orange)
That is why I asked.
The 250C came originally with a 2.5 L motor and only in 1969 was also offered with a 2.8 L.
then discontinued (in the US) as the 280 C came out..
check the engine number (or if your VIN starts 114 021 or 023)
250C 1st version had the 2.5L M114.920 motor (8,824 produced)
250C 2nd version had the 2.8L M130.923 motor (and of which 10.527 series1 & 1,241 series2 were Cs)
250CE had the 2.8 L M114.98
0 motor and 21.787 were produced) total= 41,138 C & CEs.
The 250 sedan had the same paralell, 77,000+ produced with 2.5L motor and about 34,000 with the 2.8L M130.923 motor)
The 280S (W108) had a similar motor, but not exactly the same M130.920.
It was also in the 280SE/L with the M130.980 designation, but those were fuel injected.
How is the video coming along ?