For the Vongole...
Tocai Friulano from Friuli or something from Campania: Greco di Tufo, or Fiano di Avellino or Paestum. If there is tomato in the preparation, the Tocai will do just great. Both of these wines have earthy and spicy tones and are not, when well made, too fruit driven.
For Tocai here are a few names of traditional styled wines:
Ronco del Gnemiz
Le Vigne di Zamo
Plozner
Venica Ronco delle Cime (See if you can get the 2004)
For Fiano:
Cantina del Taburno (or their Falanghina)
Benito Ferrara Grecco di Tufo
Donnaluna Fiano di Paestum by DeConciliius
Grecco or Fiano from Terradora
For the grilled sausage, how about something Piemontese? Dolcetto, Barbera or Nebbiolo.
I loved a taste of Carema Ferrando 99 white Label I had last night. It would be great with the sausageg. You could try Dolcetto from Marcarini, Podere Colla, Einaudi, Chionetti or Icardi. Barbera from Colla, Hillberg.