Welcome Jason,
Unless you have a good permanent workspace that you can afford to tie up for a very long time, my advice would be to keep the original frame.
If you're looking to buy a truck or parts, post your request's in the parts wanted or trucks wanted forums. Craigslist, ebay, farm sales etc are also very good places to look for project and or donor vehicles.
Lot's of us really like the 58-59 Task Force truck models, and we all have our different thoughts on how we want our trucks done, so you've found the best website.
We're all here to help. The more the merrier and that means more knowledge to share.
Consider yourself home.
John
