they have stamped rockers not roller on this motor.
No they are not.. It sounds like you're just an edelbrock fanboi because you didn't know how to tune a holley.well just my 2 cents but junk the flippin Holley, first of all there a pain in the [email protected]@ to get right, then they all seam to have a dead spot at the transition point.
check the following
i would remove the carb and try a different one see if problem persist
make sure you have a good coil check the ohms and put a timing light on it and see if the spark dies
good luck bro