The part YOU missed is you don't seem to know what stock height IS and you are already above that!!!! "I'd bet" the new springs match EXACTLY what is claimed of them
By the way I'm a cheap son of a *****. When I first got my 67 together, I took the stock old worn 67 spring pack all apart, along with a pack out of a junker Demon/ Duster and make one pack using the longest leafs from both packs. I don't remember I think it has 1 or 2 more leafs that stock. It's nice and stiff and raised it perfect.