If you were to start from scratch with the ign. I would have not used the 6al box myself. The 7al3 with a pro power coil and crank trigger is the vanilla / K-mart IGN of choice for me. The box gives you timing retards if you ever need them and a 2 step for launch and a burnout limiter for morons who can't keep of the chip in the box. I just had trouble last weekend with my IGN misfiring under load, but the coil was over 5 years old and the box is 8 years old. All IGN's malfunction and require replacement when you least expect it, or after you weld on the car with the IGN hooked up like I did. I have not used the digital stuff but all I am trying to do is fire the spark plug with reliable extreme voltage on time and the 7al3 works well for me.
Bruce