Pinion Snubber or not?

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.
My car was a lot heavier (S.S. D/A) than yours, and longer. We ran the 002-003 springs on it, (actually too lite) w/ the front of the rear wheel wells stretched and tubbed also. The springs had to be replaced every so often because of the weight of the car. they worked pretty good, considering the tires were not what we have today. We tore every pinion snubber we put on up in one race, it didn`t run any better w/ it on, finally gave up on running one at all. jfyi sounds like a kick a$$ car your building ! bob