Hey guys. I'm new here and look forward to hangin out. I purched a 86 jimmy (pics to come) and recently had my mechanic put a holley 570cfi on it with an edelbrock aluminun intake. I noticed that the truck definatly runs smoother (but not smooth) and a little better pick up but it seems like the secondaries are not opening up like they should and the electric choke seems to work "off and on". I have switched the spings out and tried them all but the secondaries still don't want to open all the way. He basically bolted the carb and intake on and set the timing and let me have the truck back - does this thing need to be dialed in or what? or is that all of the performace i should be getting? BTW I'm looking at 8-10mpg on the road with a 305 - sounds wierd, no? Thanks in advance. I'm gonna take it back to him sometime next week but I'd like to have something to tell him specific.