That's a mega difference between 1970 specifically and "the 70s"!!
You know how much change in styles, pop culture and technology in general changed from 1970 to 79?
It was gargantuan!!
It might as well have been 20 years or more!
Could you see a Holden Commodore or XD Falcon in say 1972? Only Mercedes could come up with something close back then.
1975 was much more like 1980 compared to 1970.
Only the very start of the project to develop the plastic carburettor we first saw in 1975 with the unveiling of the 500 twin, occurred in 73 some time. I don't know of any pictures of Powertorque motors dating from 1978/79 even though that's when development began for it's eventual unveiling in 82. I think I have seen either a wooden mock up or artist's rendering of the Vortex cover dating early as 1979!
