I personally think the regular performer intake (not the rpm), and the Torker (not the torker II) are poor manifolds for any engine, but especially a 455. Small runners and sharp bends on the performer. Lots of info on those on the forum though. A torker II or performer rpm will probably work fine for you though, and if you have other manifolds you can sell or trade to come up with one that might help as well.
As long as you get a manifold with decent size runners you are probably ok...the boost helps. Guys like Cliff R. have ported stock iron manifolds with great success on here, and I think one of those with boost would work just as well as one you'd spend money on.
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