Re: need help
A good book is "Tickford the Joy of Driving" by Gavin Farmer. Another option is to look at the handbook in any AU Falcon, as they may have specs for the XR's. At least the utes do. failing that let me know what spec you are after and I'll look them up.
Dont forget to look at the Tickford/FPV section on this site.
AUIII XR6 Ute
66 Mustang convertible
AUIII XR8 Sedan