Re: Mallory UniLite. Can I, shlould I?
Yes, you could hook up a Mallory Hyfire such as the 6AL (#6853M) or even the Hyfire 6AL-2 (#6861M). This will be an easy hook up to the Unilite Distributor, just make sure you don't use the ballast resistor. Adding this type of ignition box will help smooth out the idle, increase throttle response while making the rpms climb faster, and since its digital, hitting the rev-limit will not be an earth shaking experience. Put the HEI in the vehicle when/if you sell it!
The Promaster is an excellent coil that will typically see many years of trouble free use. You can test the resistance of the coil to see how good of shape it is. Take an ohm meter and connect both positive and negative terminals, and you should read around 0.6ohms. Give or take 10% and the coil is still good!
Just my 2cents!