Hi, I am having some issues with an engine I recently installed in my 1961 Apache 10. It is a 1957 235 that was recently rebuilt. It runs great... When it runs! It is VERY hard to start cold, and does not idle well. I know the carburetor is good, because it worked great with another engine, and the only adjustment on it is the idle speed setting. I have checked for leaks around the intake manifold and carburetor, but never found anything. The timing and vacuum advance are OK, too. This seems like an ignition problem to me, as I know it's getting fuel. Any help would be greatly appreciated. Thanks!