I’m having trouble wit the installation of a new hei distributor from speedway. It’s going in a SB327 and I had it fireing and running using a hot wire from the ignition switch. I couldn’t advance the timing as the vacuum advance hits the intake. I was told to move it a tooth and try again. I did get it to fire, backfire, blow up and all kinds of stuff but not run. I then started all over , checked tdc and re-installed everything and even ran a hot directly from the battery. It does turn over really nice and smooth unlike it before but it won’t fire at all now. I have gas sand 12-10 volts while turning at the distributor. Any ideas???