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It wont "require" one with those mods. If you planning on doing more you can wait until you get more parts like headers etc installed.
I am curious as to why you replaced the vavaram with the blackwing. Most people I see are doing the opposite.
I already have headers, heads, cam... Lingenfelter 427...
I just like the blackwing better. The vararam seems cheaply made, I drive 5 miles to work in my car so I never reap the benefits of the ram air, and I live in a climate where it rains A LOT so I'm worried about hydro locking my brand new 427.