The casting numbers are on the bottom of the exhaust ports. There is a post about identifying head for a couple years ago. The specs on your cam are almost the same as mine and I have close chamber heads but the bore is stock so you should run more compression. What are you going to run for carburetor? and if I remember you have big bore headers with mind train exhaust? Did you ever pull the pan off your old motor to see what broke?
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.