converting 2wd to 4wd 65 chevy shortbed who has done this?

[travz500]

ok who has done this using the 2 wheel drive frame? and switched it to 4x4 i know the frames on the 2 wheel drive trucks are a little smaller in the middle and not as stout but are there any tips that i need to do? i currently have the truck on a 87 blazer frame that was lengthened but dont like how it turned out so now gonna put back on the original frame and make 4 wheel drive hard to find a good shortbed 4x4 frame here is a pic on the blazer frame just dont like how it turned out and i wanna make a show truck eventually