Making my '66 C10 4 wheel drive? Best way?

[yellow400ex05]

I'm contemplating making my stock original 1966 chevy pickup and converting it to 4 wheel drive. What's the most economical way of doing this? I'd guess to say finding a transfer case for my truck would be pretty hard right? Would swapping to say an early to mid 70s blazer frame work? Could I keep my factory dash and interior? I tried looking for specific info on conversions but came up empty! Help me out! And no I don't want to buy another truck...
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