Pinion Snubber or not?

I am not sure if Kramers car used a Lakewood or
some other three bar. When I seen his car it was closed up and he was busy running the event.
As far as I can tell the Lakewood's came out a couple years later than your target build date of 68-69.
Al's Toy SS/BA also had the 3 bar and was not a bolt in universal Lakewood with the slip fit feet and rear down tube.
It may have been a weld up kit or custom made and what I would think is a better choice for 68-69 era.
Anyhow the right side vertical was not as close to the jamb or panel as bars are constructed today. This would help with your centering some with the seat.

Yes, I thing you are right about Lakewood come a bit later. Reason I use Lakewood as a reference is I have to have some sort of a Roll Bar to be able to test the car on the track. And Lakewood is early racing history, isn´t it? :)
All Lakewood 3 point I have seen, has the rear bar directed more to the left front spring hanger, rather than above the snubbe. That's way I also thing those who had some sort of a Roll Bar on this ´68-69 configuration custom made them.
On the other hand Lakewood offered several typ of Roll Bars for different car models. I don´t think I have seen one for the Mopar A-Body.