Thoughts on this combo

I think, and I could be wrong, you're not gonna hit the 450 mark with the stock stroke. Or the Performer. The AirGap is such a proven intake, why not choose it over the old Performer. Since you've done the oil system mods I'm assuming you're goinna spin this thing to 7 grand or so. Might want to look at at a premium rod.

Don't much like the Street Avenger carbs myself. Double pumper mechanical secondary all the way.

Looks like pretty darn good start though...GOOD LUCK!