hi flowing intakes

[Maccas94]

Hey everyone, basically I'm just looking around for ideas on a intake manifold and bigger throttle body to take a shed load more flow for when I start putting my built motor together and back into my BA.
Are there any companies that make hiflow manifolds or is that something I'm going to have have custom made? Also what's the best throttle body for high flow applications?

Any help is insanely greatly appreciated