Early Revell Model A kits have many of the chassis parts ,rear end, stock and dropped I beam axles. Revell 48 and 40 Fords (kits with custom options only) have great hot rodded flatheads and chassis parts.
Minatures and Replicas of Maryland has a 32 frame modified to accept the Model A parts (buggy springs) as well as Duval windshields and various other traditional parts.
Revell released 2 Model A hot rod kits recently that contain lots of great parts but they were only produced briefly (29 highboy roadster and a 30 coupe) they may return later this year.
Lots of very neat stuff out there for your projects..but it will take some looking.