The '67 FB 400 had a factory return line. I thought our host or one of the other vendors sold a repro? I have my original, but went a completely different route.
The WB02 is well worth it for tuning these EFI setups. Without it, you are in for a lot of trial and error.
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1967 Firebird Convertible Factory 400/4spd
Now 462/5spd Fuel Injected
http://1967firebird.atwebpages.com/
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