It would run fun without any sort of fuel management.
Both will affect A/F, though not a substantial amount as you're installing 2 pieces that help air ESCAPE from the motor. The more the motor can exhale, the more it can inhale, if you catch my drift.
Vacuum will change and you definitely need a dyno tune to set the cams where they need to be for your setup. For down the road, though, and since you're planning big-boy mods like cams and a ported head, you should really investigate some type of fueling management.
I take it you also have a big turbo? Adding BC3s with a ported head with a stock turbo will not yield close to the results they will when hooked to a big turbo.
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