Cutting frame from long to short

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I have a 1965 Long stepside and I am ready to make it short. I have read probably all of the threads on this site about it and feel very comfortable about the whole thing. I just want any last minute pointers that someone might feel would be useful. Who has done this and what were your experiences with it.

I plan on making the Z notch cutting the 3 inch wide 12 inch long sections from under the cab and relocating the rear cab mount so as to leave the VIN numbers intact. I will be using a torch for the cutting and an arc welder to seam it back up.

I have a short bed frame I was going to put under it, but I prefer to leave all the numbers correct. I can use this frame to make sure everything is in its correct place.

Thanks in advance forany and all information