i'm saying with a draw through, all the setups run without any charge cooling, limiting total boost that can be run, and the ones that do are cops to drive because the carby is up to a couple of meteres (cooler piping length) from the actual cylinder, where normally its only a few inches. fair to say i havent driven and tested it back to back, but i know someone that has, and has explained to me in the passed just how dramatic the difference is, i have no reason to doubt him.
regardless of whether its an L20B or a 1000hp turbo V8, the characteristics of airflow dont change, and i can't see a carby working efficiently that far from the motor... would like to see, as a point of comparison, what low load driving is like in a draw through setup... something decent though, not a standard L20B with an uncooled turbo blowing straight down the intake, something with proper charge cooling and running a meaningful amount of boost.
just to clarify, i do think draw through is fine for low boost, basic setup on an old motor, something that's only ever going to see low hp levels (like an L20B), but on a grand scale, in this day in age, i think blow through has it all over draw though