turbo: blow thru vs. draw thru

Guys I just picked up a rotomaster kit off ebay...it is the Draw through with butterflies...not trying to hi jack thread... i have a broken right hand at the moment...i just picked up a 66 cuda a few months ago and primed it in my back yard..threw wilwoods on it all the way around...now i just need to rebuild this old turbo or purchase a new one with the carbon seal in it...i really want to get this to work... as I have a .30 over 318 with a little purple shaftcam in it...