HEI vs. Mopar Box
MSD 7al box with the 7 series only coils are even better than the 6 boxs!! With a good cap and rotor and spark plug wires it run fine all day everyday on the street and be strip ready all the time. I loved my MSD 6 box untill I got a 7al box and its not that much more $. I only changed because my 6 box had no rev limter and was 8 years old. Called MSD tech and they said the MSD 6 should be good enough but if you want the 7 series get the 7al and with the right coil it be fine for everyday street use. I would not get a 6 box again now. Before with my Holley hp 750 DP carb if I punch it very fast from a dead stop it sometimes not feel very crisp for the first few seconds so I was slowly flooring it--like in 1 or 2 full seconds, go half way then all the way. Now I can punch it fast and it sounds very crisp all the time. I was worry that I was wasting money but I am glad I got it. Just thought I let everybody know what happen to me.