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.