This is a good, practical discussion of this topic by David Vizard. I have found it helpful and accurate.
http://www.hotrod.com/articles/0311em-power-squeeze/
Jack
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.