Carter 4734S

Time to pick some brains fellas.

I just picked up a Carter AVS 4734 for cheap. Picked it up with the intention of doing a rebuild. A source I trust suggested an AVS as over carbing is less of an issue thanks to the secondary operation. It codes out as a 1970 383 300hp carb w/California standards. I can't imagine what kind of emmission standards existed in '70 but how would this carb work on a well built 318? I think cfm would be around 650 and my main concern is this "emmission" thing.

Thanks.