As far as the flat hood / sport hood goes, I would love to see more early broadcast sheets for these cars. A broadcast sheet showing A01 with L31 would indicate a flat hood car. I do not have a sheet showing that - yet.
Also, are the hood springs different? I would think that a flat hood is a little bit lighter? If so, it may have used a lighter weight spring.
Can you guys with known original hoods count the coils & give the outer diameter of your springs for each hood type?