slight firecracker pops out exhaust

Just did the initial timing,i need to get a timing light on it to check the upper rpm range,i will check for vaccuum leaks as well.It has been accuring around 3000-3500.Should the eddy 600 be enough for this motor?

Operating properly the 600 carb should be fine for that application. That rpm range is corresponding with the area of full total advance so there may be some validity to my too much advance thoery. Let us know when you check it out.