Hi, I will do my best to assist you. When you are finished please click on accept. I don't get paid unless you do. I don't know if you are a pro or a novice so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answer will be based on what you have posted. Feel free to add any additional info you feel is needed.There is no stock frame that will fit without modifications. One of the most popular retrofit frames for the 50's Chevy trucks is the Chevy S10, but it fits the early 50's models better than the later 50's models. The S10 is a little on the light side, not to bad, but still a little light. If the purpose of the frame swap is to get a more modern front suspension for the truck, then the popular camaro front frame swap is a good choice. I have a link I will post HERE that shows this process in detail.There is a swap available that uses a Chevy caprice frame. If you want big disc brakes use the 94 to 95 caprice police car brake parts. I will post a link HERE for the “kit” you need for the swap. There are other options, all of the others take an extensive amount of fabrication, and modification. The caprice frame option is the best way to go. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.I hope this helps, 100% satisfaction is my goal. If the answer is not clear, please reply and I will assist you more. When you're satisfied, click on accept. I don't get paid unless you do. A bonus and positive feedback are always appreciated, good luck and Thanks.