ok a few quick queries as a few forum and google searches didnt really come up with what i'm after

basically i'd like to know the optiman throttle body diameters for different setups. now obviously most cars have different setups but i'm after a rough guide of whats an ok size, whats too big for different setups

ie. best tb diameter for

relatively stock B-series: ??
moderately modified NA B-series: ??
highly modified NA B-series: ??
low boost B-series: ??
high boost B-series: ??

now to the intake manifold side of things....
i've noticed some aftermarket intake manifold such as edelbrock have features secondary fuel rails etc.
at which stage are these beneficial and at which stages are these overkill/unnecessary?

i've seen TB's with diameters up to 70mm, i take it most intake manifolds aren't this large... i guess you would need to bore the intake up to 70mm to match the TB?

hmmm thats all the things i can remember that i wanted to ask for now lol