Re: NGD! 1976 Gibson Les Paul Deluxe or Standard... Not Sure
I think you've already pretty much got it figured out. Deluxes could be ordered with full size humbuckers back then.
Most of the features indicate it would be a '76 Deluxe, especially the serial label. If the Standard truss rod cover is original, it is probably a transition guitar, as this would have been around the time the Standard became an official model name in regular production and not a special order.
Basically, it's an "in between" model. Happens all the time all over Gibson's history.