[unruhjonny]

compare the two backs of thos gauge clusters;
notice how one has a smaller (12 conact points) plug versus the other larger (16 contact points) plug?
That change over was done some time during 1972;
Now I know that 70/71 speedos just have a brake light on the bottom of the speedo, while 73+ have both a brake and seatbelt light on the bottom of the speedo;
I am not an expert on 1972 gauges, but I'd guess the it's either a 1972 cluster, or a set assembled from other sets in a 70/71 housing.
I had thought that all 70-72 tachs only had the single prong on the back.
I do recall that the 70/71 clocks used a unique black knob, but am unsure what is correct for 1972.

I am curious as to why there appears to be a wire grounded to the circuit board, and going int the gauge cluster...

I stand corrected on the kph gauges;
the 100mph speedo with kph in blue is a 75-78 thing;
that speedo was teamed with an 8k rpm tach for 75/76 - so that set is either 75 or 76.
-77-79 gauges had a 6k rpm tach
-79 gauhes had a clock with quartz movement (iirc), and the kph turned orange (this was also the first year where export cars could have kph as the predominant reading)
-80/80 gauges look very different

As previously mentioned the TA dash insert which is setup for A/C is a 73/74 unit based on the lack of an RTS badge (or holes to mount said badge);
The other ones are 1975-1979 based on the presence of the RTS badge and the arrow shaped signal indicators (80/81 had round indicators, and the gauge cluster had an arrow painted on the green lens of each corresponding signal spot).

Tan "Formula" wheel is 1978-1981;
IIRC the only exception to pre 1978 model year cars getting a colour matched Formula wheel were 1977 Skybirds - all other 1970-1977 Formula wheels were black.
Also, 78-79 Formula wheels differ from 80/81 wheels in that 78-79 wheels used a brushed aluminum wheel core which was painted black/transparent black, while 80/81 wheels used a steel core and get a textured black paint finish.
(I believe the collar had a different texture finish, but am not sure right now.)

The Holley Street Dominator is a great (albeit discontinued) mid-rise, single-plane intake manifold.

The distributor can really only be ID'd by the stamped number...