After watching these vids...

http://www.youtube.com/watch?v=Wj2iOlwPGGg&feature=related

http://www.youtube.com/watch?v=OYV4yxXhj-4&NR=1

It obvious that if the carb has an accelerator pump, lag is no issue (good response on them vids even with huge carbs!)

Draw through seems the logical thing to do as theres no need for a return line, no need for a BOV (good point on not needing one A14Force, this reminds me of some F1 tricks - see below), tuning is easier, you dont need high pressure fuel pumps.

And with blow through I get the feeling that your trying to make something that its not (if that makes sense) since your basically turing the carb into a variable flow injector that responds to boost and engine vacuum where as in draw through the carb just sees more flow.

In Formula 1's turbo years the teams had the throttle body infront of the turbo, so when the throttle shut the turbo kept spinning in its vacuum, which is kind of like draw through (throttle plate before turbo).

So with a good design of manifold (keep fuel in suspension) and using short inlet/turbo/carb tube lengths and having it a bit up hill of the inlet, a draw through setup will perform great for the difficulty it takes - a blow through setup will take say 40% more effort to get together but will only gain 15% (if that) more than the draw through.

If anyone was wondering - my idea was to run a turbo setup (suck through) with a big ass 48mm Mikuni HSR flat slide and H20/Meth injection after the turbo. Boost wise I would plan on running no less than 1 bar. Ignition would be mechanical with the vacuum advance hooked to boost to act as boost retard - if that doesn't work I will lock the dissy and if the locked dissy runs poorly I'll run the Jaycar programmable ignition.