I'm hearing that my msd 7al maybe too much for my rebuilt 402. Is the 7AL for racing or track vehicles...Someone mentioned that a 6al provides 6 to 8 sparks to the plugs in a minute but the 7 al provides 40 to 50 sparks a minute which will just burn the plugs up in a cruiser..in about a week in a half...If so I have a MSD 7al for sell or will trade for a 6al...