I have a 408 magnum stroker from blueprint engines and it seems to run rough at idle. It’s got edelbrock performer rpm cylinder heads, edelbrock 7577 intake, edelbrock performer series 1411 750 cfm carb, msd 8388 distributer, with a blaster 2 coil. It also has a hydraulic roller cam with a .580 inch lift on the intake valve and a .577 inch lift on the exhaust valve. It’s the bpe4085ct long block off of the website. So basically, I set the ignition timing at 10 degrees btdc at idle, and with the engine warmed up at 700 rpm, attempted to adjust the idle mixture screws. With both turned all the way in the rpm only drops very slightly and runs rough the whole time. Some say I have a vacuum leak or a bad carb, some say it’s normal for an engine with a big cam to run a little rough, and they make so little vacuum that the idle circuits can’t work properly in the carburetor. I just want to know what everyone’s experiences are with either this or similar set ups and what you guys think about this.