Im glad i got monte carlo version when i had the chance, which one do you have? Unfortunatley i don't think anyone makes aftermarket decals for this kit as its a long out of production kit. Closest decals would be ones for 037, or stratos. Or you might have to make your own. Also i don't believe pe is made for it. Maybe someone else knows more than me, and they can inform you.
Some pics, which are also hard to come by.
http://www.sportscar-racing.thesaxbys.co.uk/lancia.htm