If i was you i would stay away from MSD stuff, especially the 7 series for a street car as im not sure it would like the heat a street car sees...if i was to go with a box, it would be a digital one, not one that is analog- analog is less accurate and requires you to change pills, which is expensive and a pain in the *** if you ask me...digital ones usually have a dial you can turn to whatever setting you choose...I have heard ALOT of bad things of MSD products lately- maybe there old stuff was good, but it seems like they are going down the drain quality wise...If i was you id look into something like the Mallory Highfire 6 part number#685...dont know what features your looking for, but it has alot of them...Mallory makes great stuff when it comes to boxes, but when it comes to distributors id stay msd...just my two cents