i have a holley model 4160 1850-3 600cfm and i just threw it on my 72 nova to see what it would do if anything. it idled fine but when i went to turn the adjuster screws it wouldnt do anything. where do i go from here? when i revved it quick it would stumble for a real quick second then pick back up. i couldnt take it out too much rain to really do anything. i have had problems from before with it but i rebuilt it this time around and sprayed averything out with carb clean and blew it out with air. is my metering block in need of help or should i give the mixture screw holes a good shot of carb clean?