63 Small Block Distributor / Firewall Clearance

You could go distributor-less and use some kind of a cranksensor wheel (MSD)?? Don't know much about them. Cost factor my be a issue.

Also requires the use of a Cam Position Sensor.

I researched it once (not alot, but enough to change my mind about it), because I've got a MSD DIS-4 Box collecting dust on the shelf and thought it'd be a great modification for my '74 Duster. Until I realized I needed both a Crank Sensor (Wheel) and a Cam Sensor (usually the distributor is reused as a cam sensor), along with 4 "Two Plug" coil packs and some other stuff.

So I boxed up the DIS-4, Tach adapters, and wiring and forgot about that project :D