I just completed a complete 289 engine rebuild on a 1967 comet capri. I did some modifications, .030 bore, crank ground, rebuilt heads, 4 barrel intake, headers, and an MDS coil. When I first turned the engine over for the first time I had lots of spark. The timming was out 180 so I disconectes the coil wires, and pulled the distributor to corrected it. When I turned the engine over there was no spark. Since then I have replaced the coil with a stock coil, points and condenser. Still no spark. I tested my ignition wire, it is at 12 volts on the positive side of the coil. I also have 12 volts at the negative post of the coil. There is also 12 volts at the wire that connects to the points. I have checked the grounds to the block and firewall, they are fine. Now I seem to have a very weak spark sometimes and no spark other times. I have started to pull what little hair I have left so any help would be greatly appreciated. One other thing I'm worried about is I've turned the engine over for a total of about 4 or 5 minutes trying to fix this problem, my concern is my cam and lifter break in, am I still ok? HELP!!!