carb size for mini blower

So I just won the bid on the mini blower on ebay, and I am wondering about carb size.
I have a 680 quick fuel but I know it's not going to be the one I will need to use. I've read a boost ref carb is needed and a boost ref regulator is also required. The mini blower is one of those weiand ones, I think it's a 144 but the guy says it's a 174 but can't tell. I'm not sure either. But anyway it's going on a little 318 with a scat 4 inch stroke, scat rods, forged icon pistons, xe 284 cam, rhs heads with 2.02 in, hughes rockers, mp ignition orange box, 4 speed, 3:55 gears, headers 2.5 exh.
He said he had a 850 on it when it was on a 340 cu motor. I don't know that for sure just what he had printed on his answers to questions people asked out the blower.
I was looking to go with a paxton, but have always wanted the little blower on top of the engine look, even if it's not as efficiant as the centerfugal ones. I just happen to see it on ebay yesterday and new I had to bid on it. So thats where I am at. Carb info for a little supercharger. I'm sure I will need a better fuel pump as well, I have a eletric carter but I don't think it will keep up. Thanks.