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You may have no choice, a big block may not fit your frame. Front cross-members on ALL 65-67 frames are notched to clear the Big Block balancer and pulley. Depending on when GM began phasing in this notch, your "late" 64 frame may/may not have this notch.

There IS a difference b/n 283 cranks. You probably have a later 62-67 "nodular cast iron" 283 crank. You'll need a 57-67 "forged" 283 crank. In 1962 GM began casting 283 & 327 blocks with extra clearance in the main webs and cylinder barrel bottoms to accomodate the new "nodular" cast iron...