I put a souped up 350 in a Vega ,...I'm pretty sure I can put a V6 in Fiat!!!!. I'll do the same thing I did with the Vega, don't tell the insurance company that I replaced the engine. My insurance was cheap!
I remember those days. When I worked at a Buick dealer in 1979, the dealer used a local named Bruce the Brush. Phenomenal free hand pinstriping. He had a 427 vega. We all wanted it.