Welcome Aboard
Seriously.
My Father had a 240GLT donkeys years ago - IIRC it had the 2.1 Turbo petrol engine, and was a great tool - I got to drive occasionally - he replaced it with a Granada 2.3 V6 blob, which was inferior in most respects IMHO - the only fast part of that thing was the speed with which the fuel gauge moved
It is an interesting vehicle... Shame the wiki article doesn't have much info - Have you got any pics of the mechanicals to fill in the blanks ?
The B18 is a fine engine, and capable of some quite serious work = a proper engine