Thanks for the pics! The 1.6 in the 75 looks like a smaller unit (physically, dimensionally) than a 2.0TS. Maybe it's just the TS' cylinder head is taller? Don't know.
Lippy, that is the correct orientation of the engine in the car. They are all canted/slanted slightly to the exhaust side. Our old Berlina 1750, Alfetta 2.0L, then Giulietta 2.0 had their engines canted just the same.
The reason
I think is historical. Back in the early days (and I mean 101, 105, 750-series cars) they had to cant/tilt the engine in those cars so that the carburetors would clear the chassis/bodywork. Those cars did not have much room in the engine bay! They achieved this using the motor mounts. The engineers wanted lots of performance out of their little engines and wanted a
relatively long intake manifold, yet they didn't want the intake charge to have to make turns unless it was absolutely impossible to avoid. To get that "length" into the cramped engine bay, they canted the engine to gain some room between the bodywork and the carbs.
So here's my speculation. It's not beyond the realm of imagination that Alfa never made new motor mounts for the 161-series cars (the Alfa 75) that came with the 4-cylinder engines (1.6, 1.8 and the 2.0). After all, they already share common parts with their predecessors (the 116-series Alfettas, Giuliettas, GTVs). Extending the logic to the earlier transition from 105 to 116 which again share lots of common parts, you can see that there really was no
economical reason to use new mounts when you had piles and piles of them in the warehouse
, and many more coming from factories all over Italy.
So, when your 75 1.6 Carb was put together in 1990, its "heritage" if you can call it that, dates back all the way to the 1600 Giulia TI's when you look at its engine, carbs and
motor mounts 
.
I don't
really know if this is what really happened at the factory, but given how Alfa has run itself business-wise, and engineering-wise between the 1960's and the late 1980's (evidenced in their cars produced in that time), I'd say it is a pretty good guess!
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