if all your looking for is a ''basic engine harness'' for a carbed motor there are few wires
ignition power, starter power and a couple of sensors; nothing really bundled together
run individual wires and bundle them with the existing harness (they should be in the existing harness)
if your looking for a whole truck harness that will cover everything
ezwire, painless, aaw, speedway all carry universal harnesses
58 truk has an
ezwire harness for extreme low cost