Well shortly after writing the question i came across H22A4's post. So now i am in the middle of a 4bbl conversion. Diymirage i am keeping the evap system in tact. H22A4 i may have a few questions for you if you dont mind.
Are you planning on using a carb that has a bowl vent tube so it will work with the evap canister. I have a Eddy #1400 600 cfm carb if you need one that has a vent tube.