Jerry
Get Aaron a spare to keep in the glove box. I have seen "new" ones only last 6 months (or 20 years). $8 is cheap insurance. Or better yet convert him to HEI, its SOOO much better and NO ballast resistor.
Frank
I wont argue with keep a spare resistor in the glovebox. Nobody keeps gloves in there anyway. I will disagree with HEI being SOOO much better.
Ford, GM, Honda, evey mfgr, who placed the ECU and or coil in or on the distributer had increased numbers of temperature related failures.