Manual trans behind a 400 sbc?

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I have a '78 SBC 400 in my '71 4x4, with a th350 and want to put in a manual trans. I know all that's entailed, but was wondering, since my auto is currently installed, are 400 cranks normally pilot drilled for a pilot bearing or bushing? I've done SBC 350s before and they were. I believe that most 400s came as automatics, (like this one originally did), so I don't know if they were drilled. Also on the block, there is no hole and threads where there would be for a z-bar, only a flat boss, which can be drilled and tapped. Speaking of which, how does the clutch linkage go in one of these trucks? Any pictures out there?