Cool! Have to say am a secret fan of Old Vauxhalls, Magnums, Firenza's, Chevette's, Manta's and the like. Even Mk2 Cavaliers and old Nova's and Mk2 Astra's are getting cool now in a sort of 'when-did-you-last-see-one-of-those' kind of way!
Think that one you found will be a 2.3 litre 'Slant' 4 engine, same as the HS Chevette iirc?