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The manifold positions are the same as on a 350 SBC. I know for sure because I swapped the 350 out of my truck and put in a 6.2 with no mods to the exhaust.
I searched for HMMWV tach on ebay and came up with an electronic tach driven off the oil pump. Looks like it goes where the vacuum pump would have been. The ad said it was for a 6.5 but it might fit anyway.
Based on my limited experience with these old trucks, I have found that the manual usually calls for whatever is in the transmission to go in the transfer case. My truck (not a military unit) called for 90wt in the transmission (SM465) and 90wt in the 205 t-case. My Suburban called for Dex-3...
I bought a complete kit from SS Diesel with new hoses, clamps, and two caps for the last injectors in the line. They are rubber lines with cloth over the top. Fit was good, no leaks (like I had with the vacuum cap I replaced). My kit only used clamps on the caps, not the lines themselves.
ETA...
I would probably leave it and focus on the starter.
I had a similar issue, it was a late engagement from the starter. It spun up well enough, but the bendix was slow. 12v starter, so autozone was able to test it. It passed but the guy running the test saw the issue. Swapped it out and never...