What about Todd Buttermore's HD Cleveland block? In aluminum it's gonna set you back ~$2900 and can easily be bored and stroked to 427 CI.
Julian
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.