Read I believe in HOTROD magazine a few months back or one other magazine that DART (http://www.dartheads.com/blford351.htm) has put together a stout FORD block in either the 302 or 351 configuration. Just something that you might want to look further into.
Dave
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.