Distributor upgrade

I'm looking to upgrade my points distrubutor to an HEI. How easy of a switch is this and what would you suggest I get?

I have a 1970 Nova with a stock 350.

If i where you i would just get a new setup from mallory, it is ready to install and is alot more reliable then points.

If you want HEI, I suggest you get HEI. HEI is a GM propitery "name" for their product. If you're looking for the best ignition for the money, MSD is the best, plain and simple. Mallory is also excellent. Accell is for those with "just as good" syndrome.
You can modify your original distributor with a Mallory Unilite kit, a Petronix magnetic implusle kit, and the Crane magnetic kit. All of these go in the stocker and work well. You would need to upgrade your coil for them.
The HEI isd a self-contained system, offering very good durability and high performance spark. It is limited in RPM capability, as it requires 8 points to be "in line" to fire, rather than the single "point" required by the other electronic units. To install HEI, all you need is a switched 12-volt source (no resistance) plugged into the "BAT" terminal on the cap.