changed out my entire ignition system and now when I'm driving I get a poping sound coming though the exhaust checked the timing it's right there. New msd box control module and coil,down on power and missing or poping though the exhaust what could I be missing??:confused:

Do you need to change the plug gap for the new system?Also check for proper voltage to the system.

what a good gap to run with an MSD ignition? I've tried .045 then .055 does not change. Oh it has proper voltage I checked.

As zombie 1969 had stated check the voltage, your original points system was ran through a resistance wire from ignition switch to coil + you need to run a new wire at ignition switch to your new system. check your firing order 1-8-4-3-6-5-7-2,if all this is good possible bad exhaust valve, check manifold vacuum with a gauge and see if the gauge needle is steady or is it bouncing?