Hi Randy,
Maybe you can find some information at the Airfix Tribute Forum:
http://airfixtributeforum.myfastforum.org/index.php
There is also a website where some articles scanned from Airfix magazine were posted, it was mainly about ship conversions. I can't find the website right now, but I think it belonged to Dave Coventry, who also owns the Airfix Tribute Forum (I assume he is posting under the name of 'davecov').
Is there something about Mustangs/Cavalier featured in the issue you're looking for?