True both are good ignition setups,if money is a factor M.S.D. is a bit more, but more people trust M.S.D. wich are made in Mexico. I have 454 in a 72 Caprice and run a 6al and a blaster 2 coil, with this setup dont forget to get magnetic suppresion wires, not solid core, again M.S.D. has great spark plug wires.