I have a Pontiac hei distributor of uknown origin in my 9, and I have an accel super coil on it. As Jim says, if the tranny mount and the subframe don't sag, it will have 1/4" clearence from the firewall. If you know how to adjust metal, you can make the adjustment, and no one buy you will know that it's been adjusted. All rework of metal work is a case of optical illusion, tricking the eye into beliving it's flawless.