the 327 in my 67 camaro is all original right down to the factory dated coil if it would be the same and if it would help you I could go out and take some pic's of the alt mounting and manifolds for you ?? sometimes they change stuff for car's different than truck's ,
I know that they changed to the venting in the air cleaner and went from valve pans with no holes to pans with holes in 68 (FOR CAR'S ) I'M NOT SURE WHAT YEAR THEY CHANGED THE TRUCKS ?
here is a pic I found (NOT MINE) shows the alt mounting