You probably need to say which part of the country you are in. Most folk on here are either industrial pro welders or amateur welders. I'm not sure there are many pro automotive welders on here, though obviously any competent welder could do automotive work.
A Porche forum might be a better source of help, though my impression is that professional restorers are pretty pricey.
There's also mobile welders or you could always buy the gear and have a go yourself. That's how I came to the forum.