Does anybody have any preferences? Right now I have a 650cfm Edelbrock, but it is leaking gas on the passenger side out of the secondary shaft, this is the second one that it is happening with. Has anybody else had this happen? I'm going to try to exchange it for a Holley today. I just looked online and it appears that they only have 750cfm. I don't need the 750cfm so if I can't get a 650cfm Holley, I'll try Edelbrock yet again.