Make a whole new dash from sheetmetal and just put your own style to it. It doesn't nessessarily have to look exactly like the old dash at all and you can have a much nicer and cleaner look. When your done shaping and cutting the holes out for the instruments then you can either paint it or powder coat it. Fiberglass in old cars isn't my kind of thing and I wouldn't do it but if you like that kind of look and all then go right ahead, it's not a bad thing at all it's whatever you like since it's your car.
Either do that or I guess you can try and find a dash from another car and get measurements and see if it fits, etc. I don't know if there is places that make original dashs' for the 442.
Maybe someone else here has a better idea!