Afraid I can't help you much more. I've read elsewhere that other people have had problems with certain combinations of guides and heads - Manley guides with Aussie 2v heads for example, and only sometimes. It is something to check, but if it doesn't appear to be a problem on your car, then it probably isn't.
IN any case, in my particular engine it was only one of several factors that all added up to a large collection of bent pushrods.
I'm afraid I can't tell you much more...
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.