What distributor do you run?

If you go with an aftermarket "ready to run" distributor, be aware of the height difference. They are a lot taller then the stock distributors. A-body engine compartments are tight and your plug wires will be very close to your wiper motor. At the very least you'll need to use a stock style "female" cap and angled boots. A 2-speed motor should give you a little more clearance then a 3-speed. I just got done making custom plug wires for my 68 with Pertronix distributor. It's TIGHT!