Couple points on this.
1. GM used a " restricted " line under the core support coming from the tank to the canister. It required a lot of pressure and some indirect vacuum to get vapor moving ( 1971 and up) to the carb.
2. Alcohol in fuel and greater evaporation can complicate this system. It is made to be used in a " closed vent system"
This means No breather in the valve cover, and No Edlebrock air cleaners.
3. Evaporation during heat soak will cause a smell.
Good luck! The premise is good, should help some at least
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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