In looking at your images...you might benefit from blocking the air flow over the top of the radiator.
The stock system used a panel from the hood hinge panel over the top of the radiator.
(Also had side panels.
)
You want all the air you can get going thru the radiator, and not over, under or around it.
Chuck
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.