Surging could be a lot of things. Kind of hard to diagnose. The hot soak/hard start is common with the oem carb or the Edelbrock's. A thick spacer under the carb can help, a return fuel system can help, and a electric priming pump can also help. You should be able to check the secondaries opening by propping the secondary air butterfly open and opening the throttle. Your throttle might not be opening far enough. Fairly common when switching to a Edelbrock from a OEM carb.
