I'm sorry , american friends, but all of you are wrong

!
the ultimate link between pre and post 73, with all the benefits of each period is : Carrera 3.0 !!!
non powered brakes, light weight, sound, mythic "300 km/h" tachymeter (like the RS, but at 6), still shiny rims, beautiful polished spokes (but in 6' & 7'), Rs flares, pretty little crank from the RS (less inertia), shorter gear box,
but galvanized body, efficient heating, aluminim case and most of bottom motor from the '75 Turbo, more comfortable seats, 200 bhp, R+F sway bars, etc...
The car was so well born that it was only ROW

!!!
only remains two defaults: ugly US bumpers (I agree with your theory, Jack

), and Kjet (vs MFI)...
PS: I'm kidding, of course.... But

...