Spacers if you use a regular intake, or they make a tall deck intake. Distrib. is different...you need an adjustable collar. Just out of curiousity, why did you go with a tall deck? Im active in a couple other big block boards, and this is the only one where a huge number of people that build a BBC, use a tall deck block. Im not saying it's no good, Im just wondering why, with all the different parts and fittment issues (headers), that someone wouldnt just look for a standard deck block. If it's cheap or free, I guess that's a plus! John