I didn't mean that the engine would have come from an X1/9 Abarth. Just to say that it is possible to fit a 124 type engine in a transverse set up. It's been done.
I doubt in this case it actually was a 124 engine though. I suspect that it was referred to as a 124 engine, because the Spider is the first car you'd think of (Stateside at least?) when you think of Fiat's twin cam?
As far as I know, only the group 4 Betas and X1/9 Abarth Prototipos used the 124 Abarth engines in a transverse and canted fitting? It's just the cam boxes that are different for canted engines, not the heads. I know David J. had to mix and match with one of his Allora bound engines (from an upright Abarth Strada 130).
I'm not sure if the X1/9 Abarths had long and short shafts like a Monte, (or early FWD Beta), or not?
Here's a nice X1/9 Abarth replica for sale. One of the few competition prepared X1/9 Abarth cars was actually fitted with an 8v engine in period, so its use here is authentic.
Polish X1/9 Abarth replica.
Note the (non FWD Beta) type water outlet on the head and the distributor position.





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