Mallory Hyfire Ignition problem

Picked up an epoxy-filled pertronix coil today, trying to decide if I should mount it on the intake again, or up on the firewall somewhere, I don't really want to drill into the firewall, but if that's what I need to do, then I'll do it. After some research, I had the other coil mounted completely horizontal, which might've been bad for it, since it's oil filled
That's the coil I'm running with a Mallory 6AL. Haven't had any issues with it. The 6AL is mounted under my dash and the coil is on the intake.