Frame condition

[masters]

I started teraing down my '84 K20 and I knew the frame had some rust on the back half and didn't think it was too bad. I just want to get some opinions from those who have down frame -off's before. If I decide to keep this frame it will be blasted and either painted with a very good chassis paint or powder coated. From where the bed set on the frame rusting out and the mud staying on there for no telling how long it has pit the metal and I'm wondering if it's worth my time and money or to cut down a 1-ton crew cab frame I have that can be in perfect shape with minimal work. The pics of where I cleaned a few spots so you could see the shape of the frame were cleaned off by a wore out wire wheel. Please give me your honest opinions and which route you would take if this was your truck and you were wanting to do a frame-off.