If you've converted the charging system adn guages to 12 v, when you change the coil if you change the points and condensor to 12 you can get a 12v coil, and eliminate the resistor, if you want.

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi