One thing I didn't see mentioned is past a certain RPM the MSD boxes stop throwing a multiple spark and just make a single spark (seems like it's under 2000 RPM somewhere).

You also want to watch how you route your wiring that goes to the pickup, it can pick up some stray signaling from the plug/coil wires which makes a real interesting problem to track down.


".....MPO is they are pretty much overkill for a street putter, probably half of them out there are for the boy racer look and never get pressed for their full capability...."

I totally agree with Bob on this. That being said I'm running one on my Mustang II, the 351W with performer RPM heads (no heat crossover) was a huge pain on the mornings it got below 30 degrees here and the MSD made it drivable before it came up to operating temperature.

I'm also running a 6AL (rev limiter feature) on the 57 for peace of mind with the 4 speed and 4.10 POSI. WIth the cam tha's in that one it also helps the idle unitl it's fully warm. Once either car is fully up to temperature there is no seat of the pants difference detectable.