different posters bd
the best frame for your truck is the one chevrolet built it on
best for cost, best for time and easiest to work with.
you can modify the dookie out of it and still have less time, money and effort in your build
i've learned much over the years and one thing learned: most frame swaps never get done
they end up sitting in the shop, on craigslist or on ebay.
yes a lot get done, many on this site are done.
but most of them will languish for years and then get sold