FiTech EFI system

Quick question, what's the easiest way to lock out the centrifugal advance on that distributor??? TSP Mopar Pro Series Pro Billet Distributor JM7613BK | eBay
Like I said, I am far from an expert, but why not buy a locked dist. to start with ? MSD makes one . Wish I`d gone that way, the short chevy type dist FAST sells , took a he-l of a bunch of head grinding to get clearance.