I'm certainly not an expert when it comes to this type of thing but I believe your pistons are suitable for a mild street build. Of course, that depends upon which cylinder heads you have. You're OK as long as you have closed chamber heads. If you have open chamber heads, your compression ratio might be a bit low with these pistons. You're best checking with Sealed Power for specs.
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.