The frame is an old Huffy. I can't give it a definite date. But it's an American made Huffy from the Dayton OH days. Probably towards the end.
I've got a photo from the time that I looked at that frame and said, "Hmmm.....Can I do something with that?"
I think the inspiration came when Intrepid Wheelwoman set out to build a faux Rudge. I'm pretty sure that's what made me turn to this frame and start thinking.
Huffy engine mock-up.jpg
This view isn't good enough to really identify this bike. But you might recognize some of the decals and such. There are still Huffys of this era to be found.