WE had a lot of trouble with those demons on a blower set up, redid the blower seals still ran rich and leaned out, ran out of ideas with the demons, and finally put a pair of Holleys on it, guess what ?, no more problems. TH ething that gets me is taht those demons were set up for a blower and the holleys were just a naturally aspirated setup, just a pair of Holley 1850 list 600's. See if you can beg or borrow a friends Holley 750 vacume secondary and see how she runs then.