One more thing is that with that seat angle, a layback post may be necessary if you intend to ride it a lots more than you'd think, but if you wanted a in-line post like says a Thomson, getting the seat angle around 73, 74 degrees max would help keep it looking good with in-line and saddle rail claim almost in middle*.
*modern saddle, old saddle rail is usually short and further back.
One more thing is that with that seat angle, a layback post may be necessary if you intend to ride it a lots more than you'd think, but if you wanted a in-line post like says a Thomson, getting the seat angle around 73, 74 degrees max would help keep it looking good with in-line and saddle rail claim almost in middle*.
*modern saddle, old saddle rail is usually short and further back.