Man thanks for the info......I noticed nobody said anything about the Predator Carbs I know they are old but are they pretty much out dated nowa days? I'm only spinning my 463 to 6200 rpms, just a little info for y'all, but all the lower end is forged (H-beam rods, Icon flattops, Lunati Sledge hammer crank) the heads are Edelbrock Alum Performers with Comp gold roller rockers and a Lunati barebones cam prt#60202 at summit, ignition is a MSD 6AL2...so after all that am I making the right decision on the 6200 rpm rev limit and is the 850 gonna be suffient for max HP and torque? Budgetwise my finacial advisor (my Wife) is suggesting around $700. I can get the Predator for $375 and the Quick fuel I was looking at was $530