As TT5.9 says you have so much vacuum you’ll have no issue with signal.
You should be able to make what you have get fuel mileage that will make a Honda blush.
You just have to keep tuning on it.
That said, if you do change boosters you have to remember one other thing I always forget to mention.
If your manifold has heat under it and you increase booster signal and atomization you can end up with too much vapor in the runners and cylinder. That displaces air and drops your VE and power.
You can over atomize the fuel and drop power. If your manifold has aren’t concerned about power then thats not an issue.