Solved - NEH 3803: Zagato proposal for OSCA MV 1700 GT Coupé

[Majeko]

Abarth?

[Carnut]

Abarth?

And not an Abarth!

[als15]

Lamborghini?

[morphly]

OSCA?

[Carnut]

Lamborghini?

No..

OSCA?

..but Yes!
But there's more to come up with for the point as I need its full name; I'll give you a clue in that the engine which powers it comes from a car which has already been mentioned in the guesses so far, but that car's name doesn't feature in the full name..
Locked for 24 hours for you to see if you can find it.

[morphly]

1966 OSCA 1700 GT with Ford V4 engine?

[Carnut]

1966 OSCA 1700 GT with Ford V4 engine?

Good progress but there's still something missing from the name!  It's an OSCA ***** 1700 GT (don't count the stars).
Still locked for you to fill in the rest!

[morphly]

OSCA MV 1700 GT?
since OSCA was owned by MV Agusta at that time.

[Carnut]

OSCA MV 1700 GT?
since OSCA was owned by MV Agusta at that time.

Exactly!
A Christmas point!

[morphly]

Great, thanks!

I was doubting between the Ford V4 engine and the Lancia V4 engine used in the Fulvia, because of the resemblance between the OSCA and the Lancia, and the involvement of Ercole Spada in both. But I couldn't find any information about OSCA using Lancia engines, so I went with the Ford engine.