turbo: blow thru vs. draw thru

Well, I got a Holset HX35W and a new HX40W. I guess I struck out as neither have a carbon seal even available. Plus looking at the plumbing makes me think a blow through is more compact in its function, no big carb hanging off the side of a snail at a right angle...but I suppose either is possible. O ring a Carter Accelerator pump with the marine app part and your good to go. I used to have a compressor map comparison website where you plug in your data (limited) and you get a few choices but its 401 now. anyone got a good plug in site? Half the java sites dont work anymore.