Dually build help

[wachterk]

I have a 72 c20 4x4 with a 350 and sm465. The truck is used a lot for towing and I am learning that the current setup is not what I thought it would be when we built it.

My plan is to transplant a 8.1L ( mildly built ) with a 4l80e. Use a dually front and rear from a late model chevy with disc brakes.

While I don't want to take my truck off the road for months at a time, I would like to build a complete rolling chassis that I can plant my body on later ( with fender modifications of course ). This is my hold up. I have been looking at a lot of posts trying to find out what frames I can use that my radiator support, body and bed will bolt on with out modifications. And I am. Ore confused now than I was when I started. Any information and advise would be appreciated.

Thanks in advance.