I've run both blowthrough and drawthrough on various engines, and the answer I normally give to 'which is best' is 'whichever one you can most easily adapt yourself'. Some people love sidedraught SU carbs (which happen to be very well suited to drawthrough) and find them easy to sort out. Other people curse their very name, but find running a holley with nitrophyll floats (which handle boost without collapsing) to be easy to sort for blowthrough. In the end it's really not that big of a deal, it's predominantly boost that is making the power, so it'll work well either way.

Thanks big time for picking up the typo - I definitely meant to type you 'can't' run an intercooler with a drawthrough. Believe it or not, some early Gale Banks kits actually run intercoolers (water to air ones at that) on their big block race boat turbo setups which were drawthrough carbed. not something I'd recommend.