[timsullivan]

Its not necessary to eliminate the Duraspark module as they are fully compatible with the MSD distributor. I used the MSD Pro-Billet Small Diameter Street Ford Distributor PN 9478 for my 351W based 408 stroker motor and spliced the two wire MSD distributor connection into the existing Superformance wiring 2 wire harness for the distributor and it works fine. No MSD ignition module needed and the MSD distributor is fully compatible with the Superformance factory installed Ford Duraspark ignition module that comes pre-mounted in the passenger footwell.