Looks like it's sporting balloon tires so it's not a middleweight. The ballooners for 1956 were the Phantom, Streamliner, Wasp, Deluxe Hornet and Spitfire.
If the guard is original to the frame that would narrow it down to the Wasp, Streamliner and Phantom. If the stem is original that would indicate a Spitfire or Deluxe Hornet, but those models were straightbars and the Spitfire had a bolt on kickstand. No AS bolts in the springer? Can't really go by the repainted paint scheme, but if it was duplicated you can rule out the Phantom.
My take on non original parts. Never mind, I'll mention what I think could be original to the frame. Kickstand, head badge, seat post and clamp. And the chain guard.
Starting point for an easy er resto would be a Wasp, and I think that's what it was originally.