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the blower isn't on yet and the can is a blower cam. Is that the normal amount of vac at idle? Gauge says low vac.
20" at idle seems about right with that size cam to me. But i am no expert, you have more vacuum than me and my cam is a 238 and 625 lift on both sides iirc
Blower is an F1R cog drive. Heads are AFR 225 cathedral port, intake is a FaST 102
You have a big engine with smallish heads, a long runner intake and an aggressive blower. If I have spec'd that camshaft, it would look more like 242/258 on 116. That cam you have there will likely be RPM limited, and leave power on the table.