Fantastic Ryan...I can say Im in the very fortunate category of having driven a XB Four Door GT...
Dad had an XA Four Door GT and my uncle had an '73 Four Door XB GT which had the higher horse power Cleveland..We grew up with these cars as kids and went everywhere in them... they were magnificent Grand Tourer (Tourisimo) in every sense of the word. I will never forget going down Conrod Straight with Dad in the XA at full noise..
Well done to you. You are in elite company to be building the engines in the new ones. Must be a buzz to turn up to work everyday