Electronic ignition upgrade.

I agree with the other posts here. If it ain't broke, don't fix it.
If you do want an to go the HEI route, there should be other reasons too. You could focus on optimizing the rest of the system, like going with lower resistance plug wires, making the plug wires the correct length(shorter = less resistance), using the correct spark plugs, maybe recurve the timing advance and making sure all your connections are good.