Need pointers swapping 350 TBI to 400 carb. in 87 c10

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I recently built a fairly nasty 409 to replace the stock 350 tbi in my 87 c10. My main hold up right now is doing away with the wiring harnesses under the hood. I am doing away with the computer (already wired the kickdown to a switch for the 700r4), but I am curious as to how many of the wires I really need to keep under the hood. I am keeping the stock gauge cluster, but am buying a new cluster of water temp/oil pressure/volt gauges instead of re-wiring the circuit board on the stock cluster, so it isn't mandatory for the original of these gauges to work, but would be nice if they did. I am running the stock electric fuel pump, with a mallory regulator for the carb, but still need the sending unit to read on my factory fuel gauge. I know I need to wire through the fuel pump relay as well, but other than that what do I need? Without Alldata, I can't find a good schematic of the bulkhead connector to see what is going where. I know guys do this kind of swap often, so any help would be great. Thanks, Dusty