Ill go out on a limb and ask, what timing set did you use? The edelbrock timing chain if that's what you used is confusing. I had installed it incorrectly until I dialed the cam in and nothing came up correctly. Couple other people in our small town did the same thing but they just dot to dotted it. It would run but needed excessive spark lead made no power once it was broken in.
Next thought is no power at coil while cranking but when you let off crank cycle it hits and dies. I believe this is ignition switch problem but may also be wiring related.