My Duster Adventures

Btw, the highest I got my vacuum was about 7" at idle, any suggestions on how to get that up? I realize y'all can only help me to a certain extent without cam specs and such but the only thing I KNOW about this engine is it has a torker II intake and a 650 edelbrock carb. It definitely doesn't have the factory cam but I ain't got a clue what the specs are, if its stock bore or not or any of that.