What I did on my 65 Tempest is pony up and bought an engine harness from our sponsor that was configured for HEI. Mine also was configured for an SI alternator but don't see that option for a 67 Firebird. Its not cheap but you don't splice anything on the original harness if you want to go back to points at sometime in the future.
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65 Tempest, 400, TH400
86 Fiero SE 2.8
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