'37-'39 had the long pushrods to go with the "cup" style lifers. In '40 Chevy started using the milk can style lifters with shorter pushrods. When I bent pushrods on my '38 I had to put the newer milk can lifters and shorter pushrods in it because I couldn't find a supplier for the longer pushrods.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.