I do not think the original campy wheels are hub-centric. If I recall, the center of a campy wheel is oversized to the hubs. I have had Gotti 3-piece rims on my car for years and they are stud-centric and never had an issue.
To your rims, if they are 5 x 4.5 and you use the correct lug nuts with the right chamfer angle (meaning dont use a 45 degree nut on a 60 degree rim), I don't see an issue.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.