Frame-off restoring a 1964 F100 2wd swb styleside. Are there supposed to be pads between the bed and frame mounts? I've seen some trucks with and others without. Not sure if they're factory or not. Anybody know?

I scored a rust-free bed off another truck and set it on my rebuilt chassis and the bed doesn't quite sit flat at all 8 bolt points. The forward-most mounting points sit about 1/4" off the frame. Wondering if I'm supposed to just crank the bed down to meet the frame or shim it.

 

Wood shims