From Database Review
this was at least the third movie with Ave Maria in its title after Giuseppe Collizzi's I Quattro dell’Ave Maria (Ace High) and Ferdinando Baldi's Il Pistolero dell’Ave Maria (The Forgotten Pistolero). Baldi's movie is about an amnesiac avenger and the tolling of the bells for the Ave Maria bring back fragmented memories of the fatal night on which his father was killed. I haven’t been able to discover the story behind the Ave Maria in the title of this movie.
From my post of December 2014 on Chuck Mool thread:
In some way the title The Unholy Four seems in opposition to The Four of the Hail Mary, even though in Colizzi's 2nd SW the title refers to sunset accompanied by the ringing of the Angelus bell and not directly to the prayer.
Same here, so The Twilight Avengers is a proper translation:
"Quelli ne hanno da vendere, di coraggio. E ogni sera, ai rintocchi dell'Ave Maria, compiono leggendarie imprese di giustizia"
The problem is that there is no trace of these legendary exploits in the movie...
With regard to the 97min runtime reported on the Database, my information is 90 minutes.