You'd be fine with a '68 for an Eleanor-build as there really wasn't very much differences between the two.
The fake scoops on the rear quarter panel had two intakes on the '67 but only one on '68
The dashboard is very much the same on the two also.
'67
'68
Don't think there was very much that differed in the engine room either but I don't know for sure so don't take that for granted.
Niclas