I just looked up the specs of a 6a box i recently traded for and noticed there were two 6a boxes, seriel #'s 6200 and 6246. It says the 6200 box is for 8 cyls and the 6246 is for 4 and 6 cyls. So is there no way to run the 6200 on a 4 cyl? I didn't know there were two different ones

 

im running the 6A on my car"" 6200""
that is the only one for 4clys. the 6a will work fine.
and i think that is the only msd box that you can run on a 4 clylinder car.