The injection system on these engines is of a speed density type. They calculate the airflow based on throttle position, RPM and manifold pressure. Due to this a BOV that vents to atmosphere is fine, no need for a recirculating valve.Also on another note, its hard to see in the pic but is your blow off valve a recircing type or atmospheric? Carb is a whole other animal but I know in the auto world with out having a recircing bov on a maf system it will stall out. makes it super rich.. How does that work with carb then, wont there be big rich and lean points? Have to get that wideband set up too!!